I cant remember what its called exactly, but I watched a show that explained it...think it was Through the Wormhole.

They explained it in such a way that made some sense anyway. Basically they made a map that shows the radio active decay (I think thats what it was) of the universe, showing which places were more active and which were less active.

In this way, they could trace elements back to a single point in our universe (yes, using mostly math equations, and not actual tangible evidence).

I believe in the big bang, especially when you submit the multiverse theory into it.

However, i do believe that some sort of "creator" created the big bang, and had a hand in forming life...