Which C.S. Lewis book presents material adapted from his BBC radio broadcasts about Christianity?

Mere Christianity presents material C.S. Lewis adapted from his BBC radio broadcasts about Christianity. The book was published in 1952 and grew out of talks delivered during the Second World War.

Lewis was invited to speak on Christian belief for the BBC, and his broadcasts reached a large British audience. He later revised and expanded the talks into a book. The title refers to what Lewis regarded as the central beliefs shared across major Christian traditions, rather than to a separate denomination.

The work is organized into four books: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behavior,” and “Beyond Personality.” It includes Lewis’s famous moral argument and his discussion of Christian virtues.

Mere Christianity is not a transcript of every broadcast word-for-word. Lewis edited the material for print, and some passages reflect the difference between a radio address and a carefully structured book.