An atheist's faith?

Really, a young Atheist cannot guard his faith too carefully. Dangers lie in wait for him on every side. You must not do, you must not even try to do, the will of the Father unless you are prepared to "know of the doctrine." All my acts, desires, and thoughts were to be brought into harmony with universal Spirit. For the first time I examined myself with a seriously practical purpose. And there I found what appalled me; a zoo of lusts, a bedlam of ambitions, a nursery of fears, a harem of fondled hatreds. My name was legion. Of course I could do nothing - I could not last out one hour - without continual conscious recourse to what I called Spirit. But the fine, philosophical distinction between this and what ordinary people call "prayer to God" breaks down as soon as you start doing it in earnest. Idealism can be talked, and even felt; it cannot be lived.

C.S. Lewis - Surprised by Joy (XIV Checkmate)