Which C.S. Lewis book presents Christianity through adapted wartime radio broadcasts?

Mere Christianity presents Christianity through material adapted from C.S. Lewis’s wartime radio broadcasts. Lewis delivered the talks for the BBC during the early 1940s, when Britain was at war.

The broadcasts were later revised and published in stages. The resulting book explains shared Christian beliefs rather than defending one particular denomination. Its sections discuss moral law, Christian belief, and practical Christian conduct.

Lewis’s clear, conversational style made the broadcasts accessible to listeners who were unfamiliar with theology. The book became one of his most influential works and is still widely read in discussions of Christian apologetics.

Mere Christianity is sometimes mistaken for a transcript of a single uninterrupted radio series. It is better understood as an edited book developed from several broadcast series. It also differs from The Problem of Pain, which focuses more directly on the philosophical question of suffering.