C.S. Lewis described his conversion to Christianity as complete in 1931.
Lewis had abandoned Christianity during his adolescence, but his views changed gradually during the 1920s. Conversations with fellow writers and scholars, including J.R.R. Tolkien and Hugo Dyson, helped him reconsider the Christian faith. Lewis later wrote that he became a theist in 1929 and returned to Christianity in 1931.
His conversion was not the result of one simple event. Lewis described a series of intellectual and personal changes, including his growing conviction that Christian belief could be intellectually serious. He later became an Anglican lay theologian and one of Christianity’s most influential popular writers.
The dates are sometimes compressed into a single “conversion year.” Lewis’s own accounts distinguish between his return to belief in God in 1929 and his acceptance of Christianity in 1931. That distinction explains why both dates appear in discussions of his religious life.