The truth is that religion has nothing to offer to morality. It may have some utility as a morality-assistant, but it's worthless at moral reasoning. That's not to say that no religious people can engage in moral reasoning, it's just to say that the religious part doesn't add anything to the reasoning. Well it doesn't. Moral reasoning is secular, and religion either gets it dead wrong, or muddies the issues, or simply applauds what everyone knows anyway.
— Ophelia Benson
[h/t to Dale]