Which C.S. Lewis book presents Christianity through wartime BBC radio talks?

Mere Christianity presents C.S. Lewis’s Christian ideas through talks first broadcast by the BBC during World War II.

Lewis delivered the original radio talks between 1941 and 1944. They were intended for a broad British audience during wartime, not for specialists in theology. The talks were later revised and collected into book form as Mere Christianity.

The title refers to the shared core of Christian belief rather than the distinctive teachings of one denomination. Lewis discusses morality, human behavior, repentance, and Christian doctrine in accessible language. The book became one of his most influential works of Christian apologetics.

The Problem of Pain and Miracles are also major Lewis apologetic books, but they were not collections of the BBC broadcasts. This distinction matters because Mere Christianity’s origin is specifically tied to radio, while the other works began as books with different structures and purposes.