C.S. Lewis became a Christian in 1931 after years of religious uncertainty.
Lewis had been raised in the Church of Ireland but became an atheist during his adolescence. His religious outlook changed gradually through conversations with friends and fellow scholars, including J.R.R. Tolkien and Hugo Dyson. Lewis described his conversion as a movement first toward belief in God and then toward Christianity.
He later wrote about this development in Surprised by Joy, though autobiographical accounts simplify a process that unfolded over several years. Lewis’s conversion became central to his public career: he wrote Christian apologetic works, broadcast religious talks during the Second World War, and became one of the twentieth century’s best-known Christian thinkers.