C.S. Lewis’ shift from fierce atheism to committed Christianity wasn’t sudden or tidy. It was driven by loss, strange longings that reason couldn’t explain, stubborn resistance, and conversations that reframed myth and truth.
Raised in Belfast, Lewis carried a thin, fragile faith until his mother died when he was nine. “With my mother’s death,” he later wrote in his memoir, “Surprised by Joy,” “all settled happiness, all that was tranquil and reliable, disappeared from my life.” That loss left him convinced that prayer was pointless and that any claim of a listening God was a comfort for the weak.
His disbelief only hardened with age. At Oxford he became notorious among friends for mockery and sarcasm, and the trenches of the First World War confirmed a bleak view of a universe without moral listening. He later admitted with grim honesty, “I never sank so low as to pray.”
Even at his most convinced, Lewis felt persistent disruptions that his materialist view could not swallow. Beauty, music, memory, and certain books would arouse an ache he could not locate or satisfy. Those moments nagged at him: why would a hunger exist if nothing beyond this world could fill it?
‘Amiable agnostics will talk cheerfully about “man’s search for God.” … To me, as I then was, they might as well have talked about the mouse’s search for the cat.’ That sarcastic image captures his early contempt for spiritual seekers, but it also hints at the stubborn interior tug he could not dismiss.
He called that tug Joy. “An unsatisfied desire,” he wrote, “which is itself more desirable than any other satisfaction. I call it Joy.” Lewis argued that if we have a desire no earthly experience can satisfy, the simplest explanation might be that we were made for another world. His moral outrage at cruelty reinforced the point: “My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust?”
Conversion did not arrive as a neat epiphany but as a series of stubborn concessions. He resisted for years, calling himself “the most dejected and reluctant convert in all England.” Friends like J.R.R. Tolkien forced him to reconsider a long-standing assumption: that myth and truth belong to separate realms.
Tolkien suggested that Christianity could be the true myth, a story that all human legends had been groping toward but which also happened in history. That thought reframed Lewis’ love of myth from an obstacle into a pointer. Then, on a motorcycle ride to the zoo with his brother, a final barrier collapsed: “When we set out,” he wrote in “Surprised by Joy,” “I did not believe that Jesus Christ is the Son of God, and when we reached the zoo I did.”
From that point forward, Lewis poured his intellect and imagination into explaining belief to strangers and skeptics. He wanted Christianity to stand up to reason and to stir the imagination, and he spent the rest of his life writing toward both goals. His conversion was not a tidy victory lap but an ongoing project: to show that faith could be intellectually defensible and emotionally true.
