A friend thinks it's an important implication of mechanist atheism (rightly construed) that we should not go looking for moral explanations in the supernatural. I kinda thought that was a bit "duh" to write. We shouldn't look for *any* explanations in the supernatural.
But I guess it *is* true that lots of atheists think morality is a religious concept, and cannot exist otherwise. *sigh*
As David Deutsch points out:
That last sentence there is a special case of a more general thing, namely that religious people and scientistic people have this great area of agreement, namely that reason cannot reach beyond math and science. In fact, beyond mathematical proof or scientific prediction, most of them would say.