C. S. Lewis
After his conversion to theism in 1929, Lewis converted to Christianity in 1931, following a long discussion and late-night walk with his close friends Tolkien and Hugo Dyson. He records making a specific commitment to Christian belief while on his way to the zoo with his brother. He became a member of the Church of England – somewhat to the disappointment of Tolkien, who had hoped that he would join the Catholic Church.
J. R. R. Tolkien
Tolkien's devout Roman Catholic faith was a significant factor in the conversion of C. S. Lewis from atheism to Christianity, although Tolkien was dismayed that Lewis chose to join the Church of England.