Religion is an interesting topic, merely because of the fact that man is incapable of accepting that other people believe in other things. If we could all respect each others opinions without starting wars, the world would be a better place.
I personally don't believe in god, and the reason I think most people do, is that the intricate cycle that makes up our universe is so complex, it would only make sense that a higher being made it. It also may give comfort to some people for an after life. I believe that the universe has slowly over time evolved into what it is now, a perfect complex cycle of elements and life.
I do not know the answer about the universe and no one ever will, therefore I am not necessarily right. I am just putting my opinion out there.