And that makes it less ''mystical''? Dude, ''everything from everything''? Was the inertia in this 'everything'', then decided to 'move' at some point? Where did that energy come from, if everything was already there? Once you attempt to explain inertia, explain the massive variation in inertia, necessary to implode this ''everything''. Where did the inertia for implosion come from?
It's substantiated, therefore it is less mystical. Nothing made a decision to move. Mass and potential energy provide everything required for action.
I don't know everything. Humanity doesn't know everything. But I(we) can make very educated guesses based on observations.
Observations have lead to the conclusions that we have. We didn't start with this idea that there was a Big Bang and then tried to prove it correct. That's simply what the data suggests. There's also data suggesting that our universe is just one in an infinite undulating succession of universes. And there's nothing mystical about it. It's just data.
If existence simply is, as suggested by my last assertion, then the only required for existence, in any universe, is gravity and a few elements. Gravity, hydrogen, and helium, for example, are entirely capable of producing stars, as I'm sure you know. And when stars burn through all of their fuel and begin to collapse, heavier elements are created in the process. The evolution of heavier elements from hydrogen and helium isn't magic or mysticism. It's evidenced in the 800 octillion examples that you can look up and observe every single night of your life, barring cloud cover. Those two elements, in enough quantity, can "create" or produce everything that we know to be reality.
Simple question - if you compressed all of our existence into a microscopic space, would that space contain nothing? It certainly wouldn't take up as much space as the previous version of existence, but would the compressed existence contain nothing?
No. Of course not. That compressed existence would contain everything.
The argument has never been made that everything came from nothing.
As I stated before, everything came from everything.