Which C.S. Lewis book presents radio-style conversations defending Christianity?

Mere Christianity presents C.S. Lewis’s radio-style conversations defending Christianity.

The book grew out of a series of BBC radio talks broadcast during the Second World War. Lewis aimed to explain shared Christian beliefs in accessible language rather than argue for the distinct doctrines of one denomination. The talks were later revised and collected into book form, first published in 1952.

Mere Christianity is organized around moral reasoning, Christian belief, and the implications of the Christian virtues. One of its best-known passages presents the “Lord, liar, or lunatic” argument concerning Jesus, although that short formulation is often quoted without its wider context.

The title does not mean a simplified or incomplete version of Christianity. “Mere Christianity” refers to the central beliefs historically shared by many Christian traditions. Lewis’s other works, including The Problem of Pain and Miracles, address related subjects but were not created from this BBC broadcast series.