How do you trace them back in time? Or better yet, let me just get past my stalling and be blunt, anything else would be a waste of time. It sounds to me you have little to no reason to believe what you do, so I'll take it you just have faith that is what happened. If not, and considering your answer, I think it's a fair question to ask if you can do a little better than that? Maybe start with the "time" question and how it was traced, or wherever you like.
I think God did it all, why? if for no other reason, it just makes a lot more sense to me that something was created, as opposed to just happened by itself, because I've seen things created but never saw something happen by itself. But lets dwell on your ideas for the moment.