I liked Mere Christianity and I like C.S. Lewis's writing in general, but certain parts of Mere Christianity annoyed me because it felt manipulative. The most egregious example is Lewis's trilemma which seems constructed to win arguments, although I've never seen it win a single argument, not by a good faith argument but by putting someone on the spot and demanding that they to choose between three answers; Two of which will make them sound exceedingly rude and harm their standing in society.