Faith and religion in Speculative Fiction

This time we are interested in genre books (science fiction, fantasy, horror, etc) that deal with the subjects of faith and religion. As usual, you are free to interpret the topic any way you want, but whatever your choice you are cordially invited to present one or more books to the group!

Afterwards we will have a casual and friendly chat about the books, about the subject of faith and religion in Speculative Fiction, and wherever else the conversation takes us!

You are of course welcome to bring the books you want to discuss, but it's also fine if you don't.