Yes, for me the sacrificial love of Christ is the canon within the canon. If that's cherry picking, so be it!
Ron: It appears to me that debate about moral realism (or objectivism) vs. moral relativism to be fruitless. I think everyone at heart knows that moral values really exist and aren't just subjective constructions. Otherwise, atheists wouldn't point out all the bad events in Christian history. Why would Dawkins point out the moral evils of Christians if he didn't believe that morality was something absolute and not just a cultural or biological product?
VR: Precisely. And if relativism is where naturalism leads, it lets the air out of the argument from evil. I've often wondered why the argument from evil is often thought to be somehow stronger than your average argument. It points to an explanatory gap in the theist's understanding of the world, but there are plenty of arguments that point out explanatory gaps for naturalism.
What I come up with is that, on the face of things, it allows the atheist to hang on to his or her moral purity. It presumably lets you call evil evil, and not have to fit it into some broader pattern in which it is good in some sense. But if this comes from a naturalist, and if Lewis is right that naturalism is going to lead logically to some kind of moral subjectivism, then it seems to me that that advantage disappears. You can't say of the Amalekite massacre that it is really, truly, honest to goodness evil.