Which C.S. Lewis book grew from his BBC religious broadcasts during World War II?

Mere Christianity grew from C.S. Lewis’s BBC religious broadcasts during World War II. The broadcasts were delivered between 1941 and 1944 and later revised into a book.

Lewis was invited to speak on Christian belief for a general radio audience rather than a specialist theological audience. He presented arguments about morality, human behavior, and the central beliefs shared by historic Christian traditions. The talks’ direct, conversational style helped make him widely known beyond Oxford’s academic world.

The book is divided into sections based on the broadcast series, including “Right and Wrong as a Clue to the Meaning of the Universe” and “What Christians Believe.” Mere Christianity does not attempt to describe every denominational difference. Its title refers to what Lewis regarded as common or “mere” Christianity across major traditions.