In this book, Graham Oppy examines arguments for and against the existence of God. He shows that none of these arguments is powerful enough to change the minds of reasonable participants in debates on the question of the existence of God. His conclusion is supported by detailed analyses of the arguments as well as by the development of a theory about the purpose of arguments and the criteria that should be used in judging whether or not arguments are successful. Oppy (...) discusses the work of a wide array of philosophers, including Anselm, Aquinas, Descartes, Locke, Leibniz, Kant, Hume and, more recently, Plantinga, Dembski, White, Dawkins, Bergman, Gale and Pruss. (shrink)

This article is a brief overview of major ontological arguments. The most noteworthy feature of this article is the statement of a new parody of the Anselmian and Cartesian arguments that is obviously immune to objections adverting to intrinsic minima and maxima.

This is a short introduction to ontological arguments. It begins with a brief characterization of ontological arguments that proceeds mainly by way of example. The rest of the discussion is given over to consideration of what looks like a very simple ontological argument. This consideration turns up many of the issues that arise when more complex ontological arguments are examined.

This paper, while neutral on questions about the minimality of truth, argues for the non-minimality of truth-aptness.

This book is an exploration of philosophical questions about infinity. Graham Oppy examines how the infinite lurks everywhere, both in science and in our ordinary thoughts about the world. He also analyses the many puzzles and paradoxes that follow in the train of the infinite. Even simple notions, such as counting, adding and maximising present serious difficulties. Other topics examined include the nature of space and time, infinities in physical science, infinities in theories of probability and decision, the nature of (...) part/whole relations, mathematical theories of the infinite, and infinite regression and principles of sufficient reason. (shrink)

This book is a unique contribution to the philosophy of religion. It offers a comprehensive discussion of one of the most famous arguments for the existence of God: the ontological argument. The author provides and analyses a critical taxonomy of those versions of the argument that have been advanced in recent philosophical literature, as well as of those historically important versions found in the work of St Anselm, Descartes, Leibniz, Hegel and others. A central thesis of the book is that (...) ontological arguments have no value in the debate between theists and atheists. There is a detailed review of the literature on the topic (separated from the main body of the text) and a very substantial bibliography, making this volume an indispensable resource for philosophers of religion and others interested in religious studies. (shrink)

Sceptical theists--e.g., William Alston and Michael Bergmann--have claimed that considerations concerning human cognitive limitations are alone sufficient to undermine evidential arguments from evil. We argue that, if the considerations deployed by sceptical theists are sufficient to undermine evidential arguments from evil, then those considerations are also sufficient to undermine inferences that play a crucial role in ordinary moral reasoning. If cogent, our argument suffices to discredit sceptical theist responses to evidential arguments from evil.

This book begins with a careful taxonomy of divine attributes. It continues with detailed examinations of: divine infinity; divine simplicity; divine perfection; divine necessity; omnipotence; omniscience; divine goodness; divine beauty; divine fundamentality; divine will; divine freedom; etc.

Feser (2017) presents and defends five proofs of the existence of God. Each proof is in two stages: the first stage proves the existence of something which, in the second stage, is shown to possess an appropriate range of divine attributes. Each proof is given two presentations, one informal and one formal. In this paper, I critically examine two premises from one of Feser's five first stage proofs. I provide reasons for thinking that naturalists reject both of these premises. In (...) my view, this enough to show that the proof fails: it fails to advance considerations that decide between theism and important competing positions. (shrink)

Latest version of my SEP entry on ontological arguments, which first appeared in 1996. General discussion of ontological arguments. Includes a brief historical overview, a taxonomy of different kinds of ontological arguments, a brief survey of objections to the different kinds of ontological arguments identified in the taxonomy, and more extended discussions of Anselm's ontological argument (Proslogion 2), Godel's ontological argument, and Plantinga's ontological argument.

There has been a recent explosion of interest in the epistemology of disagreement. Much of the recent literature is concerned with a particular range of puzzle cases (discussed in the Cases section of my paper). Almost all of the papers that contribute to that recent literature make mention of questions about religious disagreement in ways that suggest that there are interesting connections between those puzzle cases and real life cases of religious disagreement. One important aim of my paper is to (...) cast doubt on that suggestion. More generally, the aim of my paper is to give a reasonably full account of the recent literature on the epistemology of disagreement, and then to give a serious discussion of some of the epistemological issues that are raised by real world religious disagreements. (shrink)

I offer a minimal characterization of naturalism, with ontological, epistemological, psychological and evaluative dimensions. I explain why naturalism is attractive. I note that naturalists disagree among themselves about, among other things, the nature of values, beliefs, and abstractions. I close by responding to some standard objections to naturalism.

This paper presents an attempt to integrate theories of causal processes—of the kind developed by Wesley Salmon and Phil Dowe—into a theory of causal models using Bayesian networks. We suggest that arcs in causal models must correspond to possible causal processes. Moreover, we suggest that when processes are rendered physically impossible by what occurs on distinct paths, the original model must be restricted by removing the relevant arc. These two techniques suffice to explain cases of late preëmption and other cases (...) that have proved problematic for causal models. (shrink)

I provide a classification of varieties of pantheism. I argue that there are two different kinds of commitments that pantheists have. On the one hand, there is an ontological commitment to the existence of a sum of all things. On the other hand, there is an ideological commitment: either collectively or distributively, the sum of all things is divine.

This book guides readers through an investigation of religion from a naturalistic perspective and explores the very meaning of the term ‘religious naturalism’. Oppy considers several widely disputed claims: that there cannot be naturalistic religion; that there is nothing in science that poses any problems for naturalism; that there is nothing in religion that poses any serious challenges to naturalism; and that there is a very strong case for thinking that naturalism defeats religion. -/- Naturalism and Religion: A Contemporary Philosophical (...) Investigation is an ideal introduction for undergraduate and postgraduate students of religious studies and philosophy who want to gain an understanding of the key themes and claims of naturalism from a religious and philosophical perspective. (shrink)

This paper aims to show that Godel's ontological argument can be parodied in much the same kind of way in which Gaunilo parodied Anselm's Proslogion argument. The parody in this paper fails; there is a patch provided in "Reply to Gettings" (Analysis 60, 4, 2000, 363-7).

This paper provides a survey of philosophical discussion of the "the Turing Test". In particular, it provides a very careful and thorough discussion of the famous 1950 paper that was published in Mind.

In Pascal's Wager: A Study Of Practical Reasoning In Philosophical Theology ,[1] Nicholas Rescher aims to show that, contrary to received philosophical opinion, Pascal's Wager argument is "the vehicle of a fruitful and valuable insight--one which not only represents a milestone in the development of an historically important tradition of thought but can still be seen as making an instructive contribution to philosophical theology".[2] In particular, Rescher argues that one only needs to adopt a correct perspective in order to see (...) that Pascal's Wager argument is a good argument. Moreover, there seems to be a certain amount of contemporary support for Rescher's claim that Pascal's Wager argument can be seen to be a good argument when properly construed .[3] However, despite this recent trend to adopt a more sympathetic stance towards Pascal's Wager argument, I propose to defend the traditional view that Pascal's Wager argument is almost entirely worthless--at least from the theological standpoint. (No doubt, it has historical significance from the standpoint of decision theory; but that's a separate matter.). (shrink)

This is an initial survey of some philosophical questions about divine language. Could God be a language producer and language user? Could there be a divine private language? Could there be a divine language of thought? The answer to these questions that I shall tentatively defend are, respectively: Yes, No and No. (Because I use some technical terms from recent philosophy of language, there is an appendix to this chapter in which I explain my use of those terms.).

This paper canvasses the various dimensions along which theories of truth may disagree about the extent to which truth is minimal.

This paper attempts to provide a high-level comparison of Eastern and Western conceptions of deity. It finds some significant similarities—involving worshipworthiness and the ideal shape of human lives—and some important differences—concerning the ultimate nature of reality, the relation of supreme deity to the rest of reality, and the relative frequency of divine incarnation.

Preface -- Introduction -- Preliminary matters -- Some big ideas -- Minimal theism and naturalism -- Standard theism and naturalism -- Conclusion.

This paper discusses a wide range of anti-naturalistic argument from reason due to Balfour, Haldane, Joad, Lewis, Taylor, Moreland, Plantinga, Reppert, and Hasker. I argue that none of these arguments poses a serious challenge to naturalists who are identity theorists. Further, I argue that some of these arguments do not even pose prima facie plausible challenges to naturalism. In the concluding part of my discussion, I draw attention to some distinctive differences between Hasker’s anti-naturalistic arguments and the other anti-naturalistic arguments (...) mentioned above. (shrink)

This paper is a critical examination of Stephen Neale's *The Philosophical Significance of Godel's slingshot*. I am sceptical of the philosophical significance of Godel’s Slingshot (and of Slingshot arguments in general). In particular, I do not believe that Godel’s Slingshot has any interesting and important philosophical consequences for theories of facts or for referential treatments of definite descriptions. More generally, I do not believe that any Slingshot arguments have interesting and important philosophical consequences for theories of facts or for referential (...) treatments of definite descriptions. Friends of facts and referential treatments of definite descriptions can, and should, proceed with the construction of their theories, blithely ignoring the many Slingshots which now litter the landscape. (Of course, there may be other considerations which should give such theorists pause -- but those are other considerations.). (shrink)

I endorse the following claims in this paper. (1) Agnosticism is suspension of judgment on existence claims concerning gods and God. (2) Historical agnostics accepted (1) but unwisely insisted on further conditions best set aside. (3) Particular case agnosticism is less problematic than general principle-based agnosticism. (4) Agnostics should suspend judgment on—or, on occasion, reject—atomic claims of the form ‘God is F’.

Richard Gale and Alexander Pruss contend that their ‘new cosmological argument’ is an improvement over familiar cosmological arguments because it relies upon a weaker version of the Principle of Sufficient Reason than that used in those more familiar arguments. However, I note that their ‘weaker’ version of the Principle of Sufficient Reason entails the ‘stronger’ version of that principle which is used in more familiar arguments, so that the alleged advantage of their proof turns out to be illusory. Moreover, I (...) contend that, even if their argument did rely on a weaker version of the Principle of Sufficient reason, nontheists would still be perfectly within their rights to refuse to accept the conclusion of the argument. (shrink)

Anselmian theists claim (a) that there is a being than which none greater can be conceived; and (b) that it is knowable on purely—solely, entirely—a priori grounds that there is a being than which none greater can be conceived. In this paper, I argue that Anselmian Theism gains traction by conflating different interpretations of the key description ‘being than which no greater can be conceived’. In particular, I insist that it is very important to distinguish between ideal excellence and maximal (...) possible excellence. At the end of my paper, I illustrate the importance of this distinction by applying my discussion to the recent defence of Anselmian Theism in Nagasawa (Philos Q 58:577–591, 2008). (shrink)

This paper provides a taxonomy of cosmological arguments and givesgeneral reasons for thinking that arguments that belong to a given category do not succeed.

In On the Nature and Existence of God, Richard Gale follows majority opinion in giving very short shrift to the doctrine of divine simplicity: in his view, there is no coherent expressible doctrine of divine simplicity. Rising to the implicit challenge, I argue that---contrary to what is widely believed---there is a coherently expressible doctrine of divine simplicity, though it is rather different from the views that are typically expressed by defenders of this doctrine. At the very least, I think that (...) I manage to show that there are ways of understanding the doctrine of divine simplicity that have not yet been adequately examined. (shrink)

This chapter consists of a series of reflections on widely endorsed claims about Christian philosophy and, in particular, Christian philosophy of religion. It begins with consideration of some claims about how (Christian) philosophy of religion currently is, and then moves on to consideration of some claims about how (Christian) philosophy of religion ought to be. In particular, the chapter offers critical scrutiny of the oft-repeated claim that we are currently in a golden age for Christian philosophy of religion.

In ‘Professor Mackie and the Kalam Cosmological Argument’ , 367–75), Professor William Lane Craig undertakes to demonstrate that J. L. Mackie's analysis of the kalam cosmological argument in The Miracle of Theism is ‘superficial’, and that Mackie ‘has failed to provide any compelling or even intuitively appealing objection against the argument’ . I disagree with Craig's judgement; for it seems to me that the considerations which Mackie advances do serve to refute the kalam cosmological argument. Consequently, the purpose of this (...) paper is to reply to Craig's criticisms on Mackie's behalf. (shrink)

Atheism: The Basics is a concise and engaging introduction to belief in the non-existence of deities. Atheism has long fascinated people but debate around this controversial position may seem daunting. In this lively and lucid book, Graham Oppy addresses the following important questions: -/- • What does it mean to be an atheist? -/- • What is the difference between atheism, agnosticism, theism and innocence? -/- • How has atheism been distributed over time and place? -/- • What does science (...) tell us about atheism? -/- • Are there good reasons to be an atheist? -/- • Are there good reasons not to be an atheist? -/- • What do we mean by ‘new atheism'? -/- With a glossary of key terms and suggestions for further reading throughout, the book considers key philosophical arguments around atheism, making this an ideal starting point for anyone seeking a full introduction to the arguments between those who hold atheistic beliefs and those who do not. (shrink)

This paper begins with a fairly careful and detailed discussion of the conditions under which someone who presents an argument ought to be prepared to concede that the argument is unsuccessful. The conclusions reached in this discussion are then applied to William Lane Craig’s defense of what he calls “the kalam cosmological argument.” Perhaps unsurprisingly, the chief contention of the paper is that Craig ought to be prepared to concede that “the kalam cosmological argument” is not a successful argument. The (...) paper pays particular attention to Craig’s recent criticisms of Adolf Grünbaum’s contention that “the kalam cosmological argument” presupposes “the normalcy of nothingness”; and it also addresses some methodological issues raised by Craig’s response to my previous criticisms of his replies to critiques of “the kalam cosmological argument” provided by Grünbaum, Hawking, and Davies. (shrink)

This paper offers a short extension of the dialogue between Anselm and the Fool that is contained in "The Ontological Argument Simplified" by Gary Matthews and Lynne Rudder Baker. My extension of the dialogue ends with the Fool proclaiming that "what looks like an argument of elegant simplicity turns out to be no argument at all".

In this paper, I aim to bring out the implausibility of the claim that there is a class of philosophers of religion—holders of a particular constellation of beliefs about religion—whose religious beliefs are either uniquely rational or uniquely supported by a stock of cogent arguments. My initial focus will be on models of parties to religious disagreements. These models may be simple, but I believe that there is much to be learned from them.

The advent of formal definitions of the simplicity of a theory has important implications for model selection. But what is the best way to define simplicity? Forster and Sober ([1994]) advocate the use of Akaike's Information Criterion (AIC), a non-Bayesian formalisation of the notion of simplicity. This forms an important part of their wider attack on Bayesianism in the philosophy of science. We defend a Bayesian alternative: the simplicity of a theory is to be characterised in terms of Wallace's Minimum (...) Message Length (MML). We show that AIC is inadequate for many statistical problems where MML performs well. Whereas MML is always defined, AIC can be undefined. Whereas MML is not known ever to be statistically inconsistent, AIC can be. Even when defined and consistent, AIC performs worse than MML on small sample sizes. MML is statistically invariant under 1-to-1 re-parametrisation, thus avoiding a common criticism of Bayesian approaches. We also show that MML provides answers to many of Forster's objections to Bayesianism. Hence an important part of the attack on Bayesianism fails. (shrink)

It is a very curious thing that proponents of Idealism have considered it to be a satisfactory counter to ‘scepticism’, ‘nihilism’, and the like. On the contrary, it seems to me that Idealism is a very close cousin to ‘brain-in-a-vat’ scepticism and other anti-naturalistic fantasies. Moreover, it seems to me that Idealism is inferior to Naturalism for much the same kinds of reasons that ‘brain-in-a-vat’ scepticism and other anti-naturalistic fantasies are inferior to Naturalism: a proper weighing of theoretical virtues discloses (...) that Naturalism is the most virtuous worldview. (shrink)

This article is a reply to Michael Gettings' criticisms of a previous paper of mine on Godel's ontological argument. (All relevant bibliographical details may be found in the article.) I provide a patch to my previous -- faulty -- attempt to provide a parody of Godel's ontological argument on the model of Gaunilo's parody of Anselm's Proslogion 2 argument.

This paper discusses the finite version of the two envelope paradox. (That is, we treat the paradox against the background assumption that there is only a finite amount of money in the world.).

There seems to be a widespread conviction — evidenced, for example, in the work of Mackie, Dawkins and Sober — that it is Darwinian rather than Humean considerations which deal the fatal logical blow to arguments for intelligent design. I argue that this conviction cannot be well-founded. If there are current logically decisive objections to design arguments, they must be Humean — for Darwinian considerations count not at all against design arguments based upon apparent cosmological fine-tuning. I argue, further, that (...) there are good Humean reasons for atheists and agnostics to resist the suggestion that apparent design — apparent biological design and/or apparent cosmological fine-tuning — establishes (or even strongly supports) the hypothesis of intelligent design. (shrink)

This paper discusses attempts to explain why there are more than zero instances of the causal relation. In particular, it argues for the conclusion that theism is no better placed than naturalism to provide an "ultimate causal explanation".

This is the concluding chapter of a debate book about the existence of God: *Theism and Atheism: Opposing Arguments in Philosophy* (Gale, 2019). The book has a large number of contributors on both sides. My chapter suggests one way of unifying the contributions that are made on the atheistic side.

Recently, many philosophers have supposed that the divine attribute of omnipotence is properly understood as some kind of maximal power. I argue that all of the best known attempts to analyse omnipotence in terms of maximal power are multiply flawed. Moreover, I argue that there are compelling reasons for supposing that, on orthodox theistic conceptions, maximal power is not one of the divine attributes.

There is an important distinction between two different kinds of expressions of gratitude: propositional expressions of gratitude and prepositional expressions of gratitude. I argue that there is a corresponding distinction between two different kinds of expression of resentment: propositional expressions of resentment and prepositional expressions of resentment. I then argue that theists should suppose neither that propositional expressions of gratitude are prepositional expressions of gratitude to God, nor that propositional expressions of resentment are prepositional expressions of resentment of God.

Robert Koons has recently defended what he claims is a successful argument for the existence of a necessary first cause, and which he develops by taking “a new look” at traditional arguments from contingency. I argue that Koons’ argument is less than successful; in particular, I claim that his attempt to “shift the burden of proof” to non-theists amounts to nothing more than an ill-disguised begging of one of the central questions upon which theists and non-theists disagree. I also argue (...) that his interesting attempt to bridge (part of) the familiar gap between the claim that there is a necessary first cause and the claim that God exists is beset with numerous difficulties. (shrink)

This is a Cambridge *Element*, on the topic of atheism and agnosticism. It contains four main parts. First, there is an introduction in which atheism and agnosticism are explained. Second, a theoretical background to assessment. Third, a case for preferring atheism to theism. Fourth, a case for preferring agnosticism to theism.

This paper provides a semantics for propositional attitude ascriptions. (In this respect, the title of the paper is quite well chosen.).

Among challenges to Molinism, the challenge posed by divine prophecy of human free action has received insufficient attention. We argue that this challenge is a significant addition to the array of challenges that confront Molinism.

Nick Trakakis and Yujin Nagasawa criticise the argument in Almeida and Oppy . According to Trakakis and Nagasawa, we are mistaken in our claim that the sceptical theist response to evidential arguments from evil is unacceptable because it would undermine ordinary moral reasoning. In their view, there is no good reason to think that sceptical theism leads to an objectionable form of moral scepticism. We disagree. In this paper, we explain why we think that the argument of Nagasawa and Trakakis (...) fails to overthrow our objection to sceptical theism. (shrink)