Big Bang theory is not a theory of the creation of the universe, but rather a model of the history and evolution of the universe from its earliest moments. It wasn't really until the time of St. Augustine that the idea of "out of nothing" entered the discussion.
A reading of Genesis doesn't force the "out of nothing" into it at all.
In fact, a kind of chaotic "something" was put into form - or - something out of "something", the way Adam is formed from red mud and Eve from the rib. Something out of something.
If we really want to think about a more interesting aspect of this CREATION topic, we might well ask: "Was there a time BEFORE creation?"
If we can agree that, indeed, there was a time before creation we are set to ask some really penetrating questions of interest.
BEFORE God "created" anything He wasn't yet a Creator.
Before He created His "First" born son, He wasn't yet a Creator.
That particular point of discussion is important for a reason: TIME is the distance between EVENTS. Logically, if zero events have transpired - there is not yet a necessity for TIME.
No what?
Before God created anything or anyone or any place He was NOT a CREATOR. It follows that we can say He had nothing about which He could be said to KNOW. There was nothing to know. (Not yet created.)
He would not yet be ALL-Powerful either. The best you could say is that there was a "potential" power not as yet used.
There was nobody and nothing and God was alone without any parents, partners, friends, associates and no TIME to measure.
It now becomes very creepy, IMHO.
A human placed in solitary confinement, without interaction with others or without books and the thoughts outside one's own - plunges into madness. Sanity really is managing one's thoughts when engaged with reality. For GOD - reality was NOTHINGNESS and only BEING.
How long? Eternity? There was no time - so there was no eternity because no events ever yet occurred.
So, a tragic question now arises (at least, for me) and that is: How is GOD by definition even GOD?
On the other hand...
If the nature of the Universe is such that there has always simply been "something" but that something was chaotic... we might claw our way toward something or some person (i.e. god-like) if this person could interact with the Great Big Nothing and turn it into a Great Big Something.
Now that - that something is surely more reasonable than the Great Big Nothing (if we are inclined to be reasonable.)
Why is there "something" rather than "nothing"?
Why is there "God" if everything else isn't a "thing" until God creates it out of nothing? You See? The questions are practically silly.
In my mind, it could possibly go another way...
In my way of reckoning: only possible things actually happen.
If GOD has always been GOD that is no different than saying
the Universe has always existed (in some form or chaotic mess).
God might have been part of a chaotic mess for all I know.
I find it more likely that a BEING might well go insane as easily as a person in solitary confinement without anything to occupy the mind.
If you and I can agree on that one single, solitary premise - I can take one more step - if you are ready for it.
Here goes....
I think our entire history of the Universe, the world, of mankind, of Nature, of civilizations, politics, technology, etc. etc. is the result of a Supreme Being almost (or entirely) going mad and desperately IMAGINING into "EXISTENCE" something to occupy His mind (lest He go entirely insane.)
IF this is what happened - then - what next?
The Supreme Being might well imagine a well-ordered GIANT VIDEO GAME sort of virtual interaction using avatars, first person players, creatures, societies, the whole shebang.
This Supreme Being might well have conjured up other players to PLAY AGAINST to make it more interesting.
See where I'm going?
Human history is a series of levels in which the GOD TEAM plays against the SATAN TEAM and - to make it interesting - HE is evenly matched.
Satan and the demons were winning in Noah's Day and God cheated a little by destroying the game board ( like a spoiled child sweeping chess pieces away.)
REBOOT...
The power of the Demon avatars to manifest bodies was removed.
Jesus was the Jehovah avatar and his manifest body was murdered.
REBOOT ...
Tit for Tat...the game continues...
Until? I think the DEMONS have found their way back in ARTIFICIAL INTELLIGENCE and are about to be --again -- embodied/ this time in robot bodies.
See what fun this POV brings to the human imagination?
I'm not saying this IS a true thing -- I'm just saying you can make of GOD what you find reasonable, or you can just say: God is whatever, and it make no sense at all. We all do this. Don't we?
Atheists simply sit on the sidelines and jeer at the game players feeling superior, but their own game is not any fun at all for anybody.