In this chapter, we will investigate the ramifications of moral knowledge
for naturalism (roughly, the view that all that exists is the natural world).
Specifically, we will draw attention to a certain problem we face if the world
is purely naturalistic. We will then show how theism provides resources for
solving this problem. We’ll argue that the fact that we have lots of moral
knowledge fi ts better with theism than with naturalism. Specifically, we’ll
present reasons to think that (1) naturalists who think we have lots of moral
knowledge will have trouble rationally maintaining both their naturalism
and their belief that we have such knowledge and (2) theism better explains
the fact that we have lots of moral knowledge than naturalism does.