Which C.S. Lewis book presents Christianity through broadcasts first made during World War II?

Mere Christianity presents ideas from C.S. Lewis’s World War II radio broadcasts.

The book grew from a series of talks Lewis delivered for the BBC between 1941 and 1944. The broadcasts were intended for a broad British audience and explained shared Christian beliefs rather than defending one particular denomination. Lewis later revised and collected the material in book form.

Mere Christianity is organized around themes such as morality, belief, Christian behavior, and the nature of God. Its famous “trilemma” discussion about Jesus uses the categories liar, lunatic, or Lord, although the argument appears within a larger work rather than as the entire book’s subject.

The title means what Lewis regarded as the central or common core of Christianity. It is sometimes mistaken for The Problem of Pain, a separate 1940 book about suffering, or Surprised by Joy, Lewis’s spiritual autobiography. Mere Christianity is specifically rooted in wartime broadcasting.