Originally Posted by
Climacus
Well, when theists say things like "we can't be good without God," they don't mean "we can't be good if we don't believe in God." (Unless they're morons, of course, and we needn't discuss morons.) They mean that if God doesn't exists, then good and evil don't exist either, at least not objectively. And so we can be neither good nor evil. (Maybe they're wrong about this, but that's what they mean.)
The soundness of Hitchens' sentiment, on the other hand, is contingent on whether or not God exists. For if God exists, then there are good actions that atheists cannot perform. In example, if God exists - an all-good, all-powerful, all-knowing being - then it is a good thing to reverence him. But if you don't believe in him, you can't do so.