Which C.S. Lewis book collected his wartime BBC radio talks about Christianity?

Mere Christianity collected C.S. Lewis’s wartime BBC radio talks about Christianity. The talks were broadcast in Britain between 1941 and 1944, and the book developed from their scripts and related material.

Lewis aimed to present central Christian beliefs shared across many denominations rather than defend one particular church tradition. The work is organized around broad themes including moral law, Christian belief, and the virtues and practices associated with Christian life. Its conversational style helped make it accessible to a wide radio audience during World War II.

The title does not mean that Lewis was proposing a new denomination. “Mere Christianity” refers to what he considered the core beliefs held by historic Christianity. The Problem of Pain, published earlier, is a separate apologetic work, while The Abolition of Man is primarily a cultural and educational critique.