C.S. Lewis became a Christian in 1931 after earlier rejecting Christianity.
Lewis had abandoned Christianity during his teenage years and described himself for a period as an atheist. His return developed through conversations and reading, including discussions with J.R.R. Tolkien and Hugo Dyson. Lewis later wrote that he became a theist before embracing Christianity.
The year 1931 is associated with his conversion to Christianity, although Lewis’s changing beliefs unfolded over several years rather than in a single simple moment. He later described his movement toward faith in autobiographical works such as Surprised by Joy.
This date is distinct from 1929, when Lewis said he submitted to belief in God, and from 1955, when Surprised by Joy was published. Lewis’s conversion strongly influenced his later apologetics, fiction, and literary criticism.