As soon as we remove the supernaturalness of the universe, all we have left is Aldous Huxley's Brave New World, in which religion is to be simply a sociological tool for the future. In Julian Huxley's concept of romantic evolutionary humanism, religion has a place, not because there is any truth in it, but because in the strange evolutionary formation, man as he now is simply needs it. So it must be administered to him, because he needs it.- Francis Schaeffer, True Spirituality
With the supernatural gone we are merely shut up to anthropology, psychology, and sociology, and all that we say about religion in general and Christianity specifically falls to the ground except as it relates to a mere psychological mechanism. All the reality of Christianity rests upon the reality of the existence of a personal God, and the reality of the supernatural view of the total universe.