Which C.S. Lewis book presents his 1940s BBC talks on Christian belief?

Mere Christianity presents C.S. Lewis’s 1940s BBC talks on Christian belief.

Lewis delivered the talks over BBC radio during the Second World War, beginning in 1941. He aimed to explain shared Christian ideas in accessible language rather than defend one denomination’s distinctive doctrines.

The broadcasts were later revised and collected in book form. Mere Christianity is organized into sections commonly titled “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” and “Christian Behaviour,” followed by discussion of the doctrine of the Trinity.

The title does not mean that Lewis was presenting a new denomination. “Mere Christianity” refers to the common core of belief shared across historic Christian traditions. The book remains one of Lewis’s most frequently cited works of religious apologetics.