I've been trying to work out what I think about God's relationship to morality. Recently, I've been enjoying Philip Quinn's nice article in the Oxford Handbook of Ethical Theory. One question is exactly how God's commands relate to wrongness. He quotes Robert Adams: "My new divine command theory of the nature of ethical wrongness, then, is that ethical wrongness is (i.e., is identical with) the property of being contrary to the commands of a loving God." (p. 69).
Quinn responds, "I do not find [Adams' view] attractive because it is ruled out by fine-grained criteria of property identity of a sort I consider metaphysically plausible. An example is of the criterion that property P is identical with property Q only if whoever conceives of P conceives of Q and vice versa. According to this criterion, being ethically wrong is not identical with being contrary to the commands of a loving God, since many people, especially nontheists, typically conceive of being ethically wrong without conceiving of being contrary to the commands of a loving God." (p. 69) Quinn goes on to express his friendliness to a view on which wrongness supervenes on or is causally dependent on or made wrong by God's commands; identity is too strong.
So, I was wondering about this criterion: property P is identical with property Q only if whoever conceives of P conceives of Q. Does anybody happen to know of any arguments for this claim?
Also, is it a possibility that when nontheists conceive of wrongness, they are conceiving of being contrary to God's commands, but they just don't realize that that's what their conceiving? Maybe this is straining the notion of conception, but then Adams' identity view could meet Quinn's criterion.
Anyway, these are some areas in metaphysics and philosophy of language that I'm not too strong in, so I'd like to receive some help and perhaps references to literature.