How did C.S. Lewis become a Christian?
C.S. Lewis's autobiography of his early life describes his spiritual crisis, which was to determine the shape of his entire existence.
For many years an atheist, in Surprised by Joy he vividly describes the spiritual quest that eventually convinced him of the truth and reality of the Christian faith.
He is admirably equipped to write spiritual autobiography for the plain man, for his outstanding gift is clarity.
You can take it at two levels, as straight autobiography, or as a kind of spiritual thriller, a detective's probing of clue and motive that led up to his return to the Christianity he had lost in his childhood.