I don't believe there is a god, I haven't seen proof of one. I belive in most science, and the theories that make sense. I have seen biological cells of many kinds with my own eyes. I've watched Alkali metals ignite upon contact with water, I have collected hydrogen in a tube by putting Magnesium in hydrochloric acid, and found out it's hydrogen by getting a small explosion when putting a flame near the tube.
What am I saying? Well I'm explaing why I belive the theories which 'make sense'. They make sense to me because I have seen demonstrations in science lessons and tried experiments out for myself, and a lot of what science talks about, I have seen with my own eyes.
God however, he, she, it whatever God is, I will believe it when I see it with my own eyes. The same goes for ghosts etc.
The big bang theory seems a little loose ended though, yeah it's more beliveable than someone saying "let there be light", but still how would the collision of two paralell universes suddenly fill this universe up with stuff?
All I can really say is that I am human, another animal, made of cells simmilar to ones I have seen. And I'm ok with knowing that I DON'T know how we got here.