Naturalism, theism, obligation and supervenience

Abstract

Take naturalism to be the idea that there is no such person as God or anything like God. Many philosophers hold that naturalism can accommodate serious moral realism. Many philosophers (and many of the same philosophers) also believe that moral properties supervene on non-moral properties, and even on naturalistic properties (where a naturalistic property is one such that its exemplification is compatible with naturalism). I agree that they do thus supervene, and argue that this makes trouble for anyone hoping to argue that naturalism can accommodate morality.