Start with high-confidence christian allegory books, then narrow by subgenre or adjacent topics.
The Pilgrimage
Paulo Coelho, Julia Sanches
A Prayer for Owen Meany
John Irving
The Alchemist
Paulo Coelho
Divine and Human
Leo Tolstoy, Peter Sekirin
The Greatest Story Ever Told
Fulton Oursler
Two From Galilee
Marjorie Holmes
Faith: Stories
C. Michael Curtis
Advent in Narnia
Heidi Haverkamp
The Wind, the Road and the Way
Jenny L. Cote
Sons of Encouragement
Francine Rivers
The Way of Dante
Richard Hughes Gibson, Nicole Mazzarella
The Storytellers' Collection
Karen Ball, Melody Carlson
Silas Marner
George Eliot
Paradise Regained
John Milton