In an essay entitled “Horrid Red Things” from the God in the Dock collection, which later appears as a chapter in the longer work Miracles, Lewis makes a bold challenge to those of his day attempting to strip the Christian faith from its theological baggage, especially that of an historical* or miraculous nature.
“I think there are two things that Christians must do if they wish to convince this ‘ordinary’ modern man. In the first place, they must make it quite clear that what will remain of the Creed after all their explanations and reinterpretations will still be somehting quite unambiguously supernatural, miraculous, and shocking. We may not believe in a flat earth [and I add that most Christians in history didn’t either, contrary to the myths about Columbus] and a sky-palace. But we must insist from the beginning that we believe, as firmly as any savage or theosophist, in a spirit-world which can, and does, invade the natural or phenomenal universe. For the plain man suspects that when we start explaining, we are going to explain away: that we have mythology for our ignorant hearers and are ready, when cornered by educated hearers, to reduce it to innocuous moral platitudes which no one ever dreamed of denying. And there are theologians [and still are today] who justify this suspicion. From them we must part company absolutely. If nothing remains except what could be equally well stated without Christian formulae, then the honest thing is to admit that Christianity is untrue and to begin over again without it. [italics mine]