Which C.S. Lewis book presents arguments for Christianity as a wartime radio broadcast series?

Mere Christianity presents C.S. Lewis’s arguments for Christianity, developed from wartime radio broadcasts.

The original talks were broadcast by the BBC during the Second World War, beginning in 1941. Lewis spoke in a clear, conversational style intended for a general audience rather than specialists. He discussed moral law, human behavior, Christian belief, and the nature of God.

The broadcasts were later revised and assembled into book form. The title Mere Christianity refers to the shared core of belief held across many Christian traditions, rather than to a particular denomination. The book is divided into sections commonly titled “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.”

Lewis’s other apologetic works address related subjects, but they began differently. The Problem of Pain is a book about suffering, while Miracles examines the supernatural and reason.