The answer to that question is virtually without end.
Certainly far more broad than can be answered within a single forum post.
Best advice, do some research. Theology, Mythology and various forms of Paganism. There are others, but searching these terms specifically should get you started. Remember, you're on the internet. A literally endless source of information is at your fingertips. Explore your options and ask yourself what really feels right.
It also helps to identify what it is you're searching for? What is your motivation for searching, and what would constitute a sense of fulfillment for you, were you to find the right one?
Questions like this are your friends. They'll help you to understand yourself far more than anyone on a forum discussion could do.
Didn't exactly answer your question outright, but hope that helps....