Qualia Soup makes the case for a J.L. Mackie sort of subjectivism in ethics against William Lane Craig. I think more can be said for objectivity than he allows. As I summarized last week, in my own objections to Craig’s positions:
I, for one, am convinced atheists can have a perfectly fine naturalistic ontology of objective goodness, which allows us to determine objective degrees of goodness, and which can account for how morality in specific realizes objective goods for us (even while leaving room for objectively valid variations among values across cultures and eras) and for why murder (including genocide) is evil. I have even explored how Nietzsche himself rejects the ontological value nihilism and also argued that even were divine command theory to be true, faith-based religions would be irrelevant.
But apart from our differences in conclusions, many of his points along the way are a nice, compact primer on issues in moral philosophy.