C.S. Lewis became a Christian in 1931 after a long period of unbelief.
Lewis had rejected Christianity during his adolescence and described himself for years as an atheist. His return to belief developed gradually through reading, reflection, and conversations with friends, including J.R.R. Tolkien and Hugo Dyson. Lewis later described his conversion as a movement first toward belief in God and then toward Christianity.
He famously wrote that he was brought into Christianity “kicking and screaming,” though the phrase summarizes a longer process rather than one single moment. Lewis’s conversion influenced nearly all of his later work, including The Pilgrim’s Regress, published in 1933, and his radio talks on Christian belief. Some accounts distinguish between his 1930 return to theism and his 1931 acceptance of Christianity; 1931 is the standard year given for the latter.