I’m looking for something to believe in outside of any religious books. Any recommendations?

I guess I don't understand what you're looking for. You want to believe in something nonspiritual? Something that requires no faith? How about Education, Democracy, Charity, or the Law? They require little or no spiritual enlightenment.

Try a New Earth by Edkhart Tolle. It is the most helpful book with usable information I have ever read, written by a very very wise man. For some very interesting information about the Nature of Reality try Jane Roberts book Seth Speaks.

try Epictetus

If you are willing to believe in something imaginary, then choose anything that you enjoy.

If you are only interested in reality then before accepting, first examine the testable evidence.

I believe in what's real, reality.

Science best describes reality, using HUNDREDS of different fields, ranging from geology, to climatology, to chemistry, to biology, to quantum physics.

Take ur pick, they're all GREAT.