Define "God"?
I think there is "something" since if you keep looking back, there simple can't just be a big bang, or even further back.... those multiverses or parallel universes must have started out of something.
One theory is that some sort of almighty power, I call him "God", he started it all, time, spacetime and atoms, over an un-understandeble amount of time this matter was compressed into a really small area OR over a massive amount of space, this pulled the trigger and it created the big bang of the first universe.
Since we are never able to see universes in other dimensions we could be universe # 1, or universe # 2 or even universe # 723871247887954.
Kinda funny to see that our universe is 13,7 billion years old.
A universe can survive for a few trillion years.
At an age of 13.7 billion, it's not even 1% old yet.
Just an example to see how BIG everything realy is