Atheism has no genuine moral standards apart from utilitarianism and hedonism. Individual atheists may ascribe to moral truths that transcend utilitarianism and hedonism, but they are borrowed moral truths. There is no sure-founded well-dug well in atheism from which to draw moral truths.
The most careful and thoughtful atheist thinkers and philosophers, such as Peter Singer, pretend to nothing beyond utilitariansim and hedonism. They have seen atheism clearly in its wretched, spare poverty of moral thought and hold its dour vision honest.
A superb and well-written and well-argued post - laden with truth about morality.