Jargon, not argument, is your best ally in keeping him from the Church. Don’t waste time trying to make him think that materialism is TRUE! Make him think it is strong, or stark, or courageous – that is the philosophy of the future.

Letters from a senior devil (Screwtape) to a junior devil (Wormwood)

It sounds as if you supposed that ARGUMENT was the way to keep him out of the Enemy’s clutches. That might have been so if he had lived a few centuries earlier. At that time the humans still knew pretty well when a thing was proved and when it was not; and if proved they really believed it. They still connected thinking with doing and were prepared to alter their way of life as the result of a chain of reasoning.

Letters from a senior devil (Screwtape) to a junior devil (Wormwood)