Prior probabilities in the argument from fine-tuning

Faith and Philosophy 22 (5):641 - 653 (2005)
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Theism is a far simpler hypothesis, and so a priori more probably true, than naturalism, understood as the hypothesis that the existence of this law-governed universe has no explanation. Theism postulates only one entity (God) with very simple properties, whereas naturalism has to postulate either innumerable entities all having the same properties, or one very complicated entity with the power to produce the former. If theism is true, it is moderately probable that God would create humanoid beings and so humanoid bodies; but laws of nature would have to have very special properties if they are to bring about the existence of humanoid bodies. Given laws of the present form, the constants of the laws and variables of the boundary conditions of the universe would need to be extremely fine-tuned. So the evidence of the existence of humanoid bodies adds further to the probability of theism as against naturalism. (edited)



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