As we read the works of nineteenth-century atheists, we find that they were not particularly concerned to prove that God does not exist. These atheists tacitly assumed God’s nonexistence. Instead, they said that after the Enlightenment, now that we know there is no God, how can we account for the almost universal presence of religion? If God doesn’t exist and human religion is not a response to the existence of God, why is it that man seems to be incurably homo religiosus—that man in all of his cultures seems to be incurably religious? If there’s no God, why is there religion?