Which C.S. Lewis book presents his wartime radio talks about Christian belief?

Mere Christianity presents C.S. Lewis’s wartime radio talks about Christian belief.

The book developed from a series of BBC radio broadcasts Lewis delivered between 1941 and 1944. The talks were intended to explain central Christian ideas to a broad audience during the Second World War. Lewis used direct language, analogies, and logical argument rather than writing a technical theological treatise.

The original broadcasts were later revised and published in separate volumes, including Broadcast Talks and Christian Behaviour. These materials were eventually combined under the title Mere Christianity. The book is arranged in four sections: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.”

Mere Christianity is not a biography and does not focus on one denomination. Lewis presented what he regarded as common ground among historic Christian traditions. The title refers to that shared core, not to a church officially named “Mere Christianity.”