I know that you're just joshing me ";^) Nothing depressing about the book, lots of adventure and even a little humor.
Fantasy is just the genre. By definition if it has any component of the supernatural you describe it as Fantasy. Most of the book is in fact fairly down to earth. At least down to earth if you're a Christian and believe in the intervention of God in human events.
Hey, it's free. If you start reading it and don't like it you can always delete it. I've paid for books that I stopped reading after a hundred pages.
Your definition of fantasy appears to be quite different from mine.