C.S. Lewis became a Christian in 1931.
Lewis’s return to Christianity was a gradual process rather than a single isolated event. He had abandoned his childhood faith during adolescence, but conversations with fellow writers and scholars, including J.R.R. Tolkien and Hugo Dyson, helped him reconsider Christianity. Lewis described himself as becoming a theist in 1930 and a Christian in 1931.
His conversion shaped nearly all of his later public writing. He became an Anglican layman and produced works of Christian apologetics, fiction, and devotional reflection. Accounts sometimes simplify the story by assigning one exact moment or one sole influence, but Lewis’s own descriptions emphasize a developing intellectual and spiritual journey. His 1955 autobiography, Surprised by Joy, discusses this path in detail.