Need Recommendations for Novels Featuring Characters Going through Crisis of Faith

I’ve recently came up with an idea for a project I want to work on very soon, but in order to start it, I need to read at least seven novels that feature at least one character (not necessarily the protagonist, though that would be preferable) who struggle to retain belief in God.

Any novel from any genre is appropriate and they can be old or new. Self-published, traditional published, and indie published novels are all acceptable, too, as are ebooks and print books. I don’t care who the author is, either. The only other limitation I must add is that the novels must be written in English (it’s the only language I can read well, though I can read a little bit of Spanish). You can even recommend your own novel, if you want.

As long as the novel features at least one character who struggles to retain belief in God (the resolution to that struggle is irrelevant), I’ll read it.

-Tim