My dear Wormwood, 
You know—Christianity and the Crisis, Christianity and the New Psychology, Christianity and the New Order, Christianity and Faith Healing, Christianity and Psychical Research, Christianity and Vegetarianism, Christianity and Spelling Reform. If they must be Christians let them at least be Christians with a difference. Substitute for the faith itself some Fashion with a Christian colouring. Work on their horror of the Same Old Thing....
You will find that a good many Christian-political writers think that Christianity began going wrong, and departing from the doctrine its Founder, at a very early stage. Now this idea must be used by us to encourage once again the conception of a ‘historical Jesus’ to be found by clearing away later ‘accretions and perversions’ and then to be contrasted with the whole Christian tradition. In the last generation we promoted the construction of such a ‘historical Jesus’ on liberal and humanitarian lines; we are now putting forward a new ‘historical Jesus’ on Marxian, catastrophic, and revolutionary lines. The advantages of these constructions, which we intend to change every thirty years or so, are manifold. In the first place they all tend to direct men’s devotion to something which does not exist, for each ‘historical Jesus’ is unhistorical.
The documents say what they say and cannot be added to; each new ‘historical Jesus’ therefore has to be got out of them by suppression at one point and exaggeration at another, and by that sort of guessing (brilliant is the adjective we teach humans to apply to it)
on which no one would risk ten shillings in ordinary life, but which is enough to produce a crop of new Napoleons, new Shakespeares, and new Swifts, in every publisher’s autumn list. In the second place, all such constructions place the importance of their historical Jesus in some peculiar theory
He is supposed to have promulgated. He has to be a ‘great man’ in the modern sense of the word—one standing at the terminus of some centrifugal and unbalanced line of thought —a crank vending a panacea. We thus distract men’s minds from who He is, and what He did.... C.S. Lewis, The Screwtape Letters (originally 1942; this edition: Harper Collins, 1996) 123-124, 126.
It is the unexpected visitor (when he looked forward to a quiet evening), or the friend’s talkative wife (turning up when he looked forward to a tête-a -tête with the friend), that throw him out of gear. Now he is not yet so uncharitable or slothful that these small demands on his courtesy are in themselves too much for it. They anger him because he regards his time as his own and feels that it is being stolen. You must therefore zealously guard in his mind the curious assumption ‘My time is my own’. Let him have the feeling that he starts each day as the lawful possessor of twenty-four hours. Let him feel as a grievous tax that portion of this property which he has to make over to his employers, and as a generous donation that further portion which he allows to religious duties. But what he must never be permitted to doubt is that the total from which these deductions have been made was, in some mysterious sense, his own personal birthright. 
My dear Wormwood,
Even under Slubgob you must have learned at college the routine technique of sexual temptation, and since, for us spirits, this whole subject is one of considerable tedium (though necessary as part of our training) I will pass it over. But on the larger issues involved I think you have a good deal to learn.
The Enemy’s demand on humans takes the form of a dilemma; either complete abstinence or unmitigated monogamy. Ever since our Father’s first great victory, we have rendered the former very difficult to them. The latter, for the last few centuries, we have been closing up as a way of escape. We have done this through the poets and novelists by persuading the humans that a curious, and usually shortlived, experience which they call ‘being in love’ is the only respectable ground for marriage; that marriage can, and ought to, render this excitement permanent; and that a marriage which does not do so is no longer binding....
Your affectionate uncle,
SCREWTAPE
CS Lewis, The Screwtape Letters (originally 1942; this edition: Harper Collins, 1996) 93.
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