What title did C.S. Lewis’s BBC broadcast talks later receive in book form?

C.S. Lewis’s BBC broadcast talks later received the book title Mere Christianity.

Lewis delivered the talks during the Second World War, beginning in 1941, for BBC radio. They were intended to explain and defend central Christian beliefs to a broad audience rather than promote one particular denomination.

The talks were revised and published in separate volumes before being collected as Mere Christianity in 1952. The book is organized around moral awareness, Christian belief, and the meaning of Christian conduct, using accessible arguments and analogies.

The title does not mean that Lewis was presenting a new denomination. “Mere Christianity” refers to what he saw as the common core shared by historic Christian traditions. The work remains one of his most widely read nonfiction books.