C.S. Lewis publicly converted to Christianity in 1931 after years of uncertainty.
Lewis had rejected Christianity in his youth, but his views changed gradually through reading, conversation, and reflection. He described himself as returning to Christianity in 1931, becoming a member of the Church of England.
His discussions with J.R.R. Tolkien and Hugo Dyson were important in this period. Lewis later said that his conversion was not a sudden emotional experience but the result of an intellectual and spiritual process. Tolkien and Dyson helped him reconsider the relationship between myth, history, and Christian belief.
Lewis’s conversion preceded his major Christian writings, including The Problem of Pain and Mere Christianity. Some accounts distinguish between his earlier move toward belief in God and his later acceptance of Christianity, so 1931 is the key year for the Christian conversion itself.