Which C.S. Lewis book presents Christianity through radio talks adapted for general listeners?

Mere Christianity presents C.S. Lewis’s explanation of Christianity through material adapted from radio talks for general listeners. The book was published in 1952.

Lewis originally delivered the talks for the BBC during the Second World War. They were intended for a broad audience rather than specialists, and Lewis used direct language, illustrations, and everyday moral reasoning. The talks were later revised and collected into the book now known as Mere Christianity.

The title refers to the central beliefs shared across many Christian traditions, not to the name of a separate denomination. Lewis organizes the work around morality, Christian belief, and the virtues and practices of Christian life. Its accessible style helped make it one of his most influential works of apologetics.

The Problem of Pain is also a Christian nonfiction book by Lewis, but it is a different work focused especially on suffering and the problem of evil. Mere Christianity is the one derived from the wartime broadcast talks.