Which Christian book by C.S. Lewis adapted radio broadcasts first aired during World War II?

Mere Christianity adapted radio broadcasts first aired during World War II.

The BBC broadcast Lewis’s talks from 1941 to 1944, when Britain was at war. The talks were intended for a broad audience rather than specialist theologians, and Lewis presented an argument for shared Christian beliefs across denominational divisions.

The material was later revised and collected as a book. Mere Christianity is organized in four parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.”

The title refers to what Lewis called the common or central beliefs of Christianity, not to a separate denomination. The book is often confused with The Problem of Pain, which was published in 1940 and addresses suffering and divine goodness. Mere Christianity grew directly out of Lewis’s wartime broadcasting work and became one of his most widely read works of Christian apologetics.