Kai Nielsen, an atheist philosopher who attempts to defend the viability of ethics without God, in the end admits:
We have not been able to show that reason requires the moral point of view, or that all really rational persons, unhoodwinked by myth or ideology, need not be individual egoists or classical amoralists. Reason doesn’t decide here. The picture I have painted for you is not a pleasant one. Reflection on it depresses me…. Pure practical reason, even with a good knowledge of the facts, will not take you to morality.
— William Lane Craig, from Reasonable Faith, p. 61