C.S. Lewis experienced the Christian conversion he later described as complete in 1931.
Lewis had returned to belief in God by 1929, after years of atheism and intellectual debate. He described his conversion to Christianity as developing through conversations with friends including J.R.R. Tolkien and Hugo Dyson. In September 1931, he wrote that he had accepted Christianity as the true religion after a decisive period of reflection.
The change was gradual rather than a single public event. Lewis had first moved from atheism toward theism, then toward Christianity. This sequence matters because biographies often give 1929 and 1931 for different stages of his religious development.
After 1931, Lewis became one of the most influential Christian writers of the twentieth century. His books combined apologetics, literary criticism, imagination, and moral argument. He was a member of the Church of England, and his religious writing included both scholarly works and popular broadcasts.