Do you believe in God?

Not religion, I was taught in christianity religion has nothing to do with believing in God, but by practicing works, I'm asking a simple question? If you don't believe in God then what do you believe in? If you think about it the whole atmosphere is an unexplainable mystery that does exist and we are here to prove it, and were did it all come from, who thought of it all? Why do people know to mate and mating causes reproduction to us its love to nature its the circle of life, so many life mysteries and yet so many fail to think there is something higher then us who thought of it all? What's your opinion?