From The Screwtape Letters—a fictional work written from a senior demon’s perspective, advising a junior tempter.

The real fun is working up hatred between those who say ‘mass’ and those who say ‘holy communion’ when neither party could possibly state the difference between, say, Hooker’s doctrine and Thomas Aquinas’, in any form which would hold water for five minutes. And all the purely indifferent things—candles and clothes and what not—are an admirable ground for our activities.

The Screwtape Letters
C. S. Lewis