What religion did C.S. Lewis embrace again in 1931?

C.S. Lewis embraced Christianity again in 1931. His return followed years in which he described himself as an atheist, and it became a defining influence on his fiction, scholarship, and apologetic writing.

Lewis had been raised in the Church of Ireland but lost his childhood faith during adolescence. In adulthood, conversations with Christian friends and fellow writers, including J.R.R. Tolkien and Hugo Dyson, contributed to his renewed belief. He later described his conversion as a movement first toward belief in God and then toward Christianity.

Lewis’s religious identity was Anglican, specifically within the Church of England, rather than Roman Catholic. His books Mere Christianity, The Problem of Pain, and The Screwtape Letters explain or dramatize Christian ideas for general readers. The year 1931 is associated with his return to Christianity, while some accounts distinguish stages in the process rather than presenting it as one instantaneous event.