It’s not religious fiction. It’s more a collection of essays (or lectures, organized in the back of the book) with a sort of thriller storyline in the novel to

It’s not religious fiction. It’s more a collection of essays (or lectures, organized in the back of the book) with a sort of thriller storyline in the novel to make the reading more fun and explain better how the narrator is reacting to the lectures. But you could get a lot out of it by simply reading the appendix, which contains the arguments.