How does this apply to today?
You will find that a good many Christian-political writers think that Christianity began going wrong, and departing from the doctrine of 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.
—from The Screwtape Letters
— A Year with C.S. Lewis: Daily Readings from His Classic Works by C.S. Lewis