Infinite Big Bangs

Yes lets brainstorm together
forget all religion for now.
How did the universe start? obivously the big bang if there was only 1 is only the half way point of the universe, think of how long it took to pull all that mass together toget to the big bang in the first place, where did that matter come from?
Probaly the most mindboggling thing I have ever set my mind on, this subject that is