What was C.S. Lewis’s first published novel after his conversion to Christianity?

The Pilgrim’s Regress was C.S. Lewis’s first published novel after his conversion to Christianity. Published in 1933, it is an allegorical journey by a character named John through a landscape of competing beliefs and philosophies.

The book reflects Lewis’s intellectual and spiritual development after his return to Christian belief. Its subtitle, An Allegorical Apology for Christianity, Reason and Romanticism, signals that it is both a religious defense and a response to ideas Lewis had encountered in modern intellectual life.

Readers sometimes confuse it with The Screwtape Letters, which was Lewis’s next major fictional treatment of Christian themes and appeared in 1942. The Pilgrim’s Regress is also distinct from John Bunyan’s The Pilgrim’s Progress, although Lewis deliberately uses the older work’s journey-and-allegory tradition.