I agree with Tom's appraisal of this post.

I would just add that the "secular tradition" referred to in the last paragraph has been largely sustained by monotheism's gift of the metaphysical assumption that the moral world is real and knowable.

As regards Tom's report that Dawkins wants us to look to moral philosophers for guidance about matters of right and wrong, I wonder which philosophers Dawkins has in mind? Does he mean Karl Marx, who wrote in the Communist Manifesto:

Communism abolishes eternal truths, it abolishes all religion, and all morality, instead of constituting them on a new basis.

Or does he mean Nietzsche, who proclaimed that "God is dead" and that "Morality is the herd-instinct in the individual"? Or perhaps he is thinking of Peter Singer, a self-proclaimed moral rationalist whose reason has led him to conclude that chimpanzees have rights similar to those of human beings?