Even an atheist can understand the logic of life beginning at conception.....if not, when is that “magic moment” when it becomes a life? What about one millisecond before that? Where is that line drawn? So if we cannot determine that, error on the side of caution, I say....even an atheist could understand that.
God assigns a conscience to all men - whether or not they acknowledge His existence. So I never posit ‘even atheists’ are decent, human beings.