Let him begin by treating the the Patriotism…as part of his religion. Then let him, under the influence of partisan spirit, come to regard it as the most important. Then quietly and gradually nurse him on to the state at which the religion becomes merely a part of the ’cause,’ in which Christianity is valued chiefly because of the excellent arguments it can produce…Once he’s made the world an end, and faith a means, you have almost won your man, and it makes very little difference what kind of wordly end he is pursuing.
–Screwtape to Wormwood in C.S. Lewis, The Screwtape Letters