Religion cannot and should not be replaced by atheism. Religion needs to go away and not be replaced by anything. Atheism is not a religion. It’s the absence of religion, and that’s a wonderful thing.
Religion is not morality. Theists ask me, “If there’s no god, what would stop me from raping and killing everyone I want to.” My answer is always: “I, myself, have raped and killed everyone I want to … and the number for both is zero.” Behaving morally because of a hope of reward or a fear of punishment is not morality. Morality is not bribery or threats. Religion is bribery and threats. Humans have morality. We don’t need religion.