I agree with susanslover. The universe had to have started somewhere...God. How can a chemical reaction happen? Where did that come from? God started it all. That is my belief.

The question was where ALL this come from. I don't believe in god(s), accident chemical reactions is too simplified (not just chemistry involved, the "accident" is baised agianst the opinion), evolution is concerned only with the origin of life and diversity of it, so it's not an explanation for ALL THIS (tha tha duuum).
Universe existing since always ... well, I don't know about this one.

If universe started because of god(s), where did god(s) start, then?

There really isn't a way to know. The Bible was written by people (and people lie) aside from being written 40 years after Jesus dies. Evolution doesn't work. We have monkeys. We have people. Where's the in-between. Unlike dogs, we have wolves, we have dogs, but coyotes/foxes/etc act as in-betweens. Accidental chemical reactions? So every element humans are made of "accidentally" came together? The whole beginning end thing still puzzeles me. There had to be something before it all, yet forever is impossible. My head hurts just trying to figure it out. BTW I'm not saying religion is wrong, it just can't be proven.

agnostic