Which C.S. Lewis book collects his 1941 BBC radio talks on Christian belief?

C.S. Lewis’s book collecting his 1941 BBC radio talks on Christian belief is Mere Christianity. The broadcasts were delivered during the Second World War and later revised and expanded into book form.

Lewis was invited to speak on Christian themes by James Welch, the BBC’s director of religious broadcasting. His talks were intended for a broad radio audience rather than only for specialists. They discussed morality, human nature, Christian doctrine, and the meaning of faith in accessible language.

The title Mere Christianity refers to the core beliefs shared across many historic Christian traditions. Lewis did not intend the book to present the distinctive practices of one denomination. The work is often confused with The Problem of Pain, which was published earlier as a theological study, and with The Abolition of Man, which focuses on moral philosophy rather than being a radio-talk collection.