Then I had a really weird thought about the nature of Spacetime, how time doesn't really have a flow, it's all already there, like a deck of cards thrown on the floor.

That's more or less how I think of existence. The future is as real and complete as the past. The really trippy part is, if time is a feature of existence from the Big Bang to the Big Smash (a term I think I just made up, but when/if the universe collapses in on itself after the Bang reaches its furthest radius), then what happens to past and future once all of existence is contained within that infinitely dense dot, before and after the universe exists?

I think there's a big difference between "God" (though I grant you that this term is really not well defined by anyone) and a "god-like being". No matter how infinite the number of universes - whether multi-verse, or infinitely oscillating universe, everything can and will exist except for the impossible. "God" as the monotheistic religions tend to define it, is a bit too absurd, even for infinity.