That actually could mean specifically that the (whatever it is that would eventually make up the matter of the universe) always existed... if always is even a coherent term here.
It couldn't have always existed, because again, something cannot come from nothing, so at some point, that something had to of come from something.
You just said at length that this specific event could not occur so as per your argument there was never a time when there was nothing and then there was matter. Again if any of those terms even have any meaning in this context.
So far you have not eliminated the possibility of all the (whatever would eventually evolve into all the matter) existed for all of (whatever passed for time before the big bang).
So far I don't require a creator even if I accept for the purposes of this argument that the big bang could not have been a spontaneous event.
Ok. Couple things to point out.
First off, Time is measurable. That is one of the main ways that we figured out the Big Bang, my measuring space, and using time as a measurement.
Time is measurable; therefore, time must have a start, and anything that exists before time, cannot exist because you need both time, space, and matter, for something to exist.
Secondly at some point there had to be nothing. That means no time, space, or matter. It is really hard for humans to picture nothing, because even a black void is something. Now why did there have to be this point? Because if something exists then there has to be something that created it, and before that thing created it, that something wouldn't exist.
One does not logically follow. The story of the universe would seem to be one of increasing complexity. Of the intelligent literally arising from from the interactions of unintelligent cells. I have no reason to surmise that the cause of the big bang (should the big bang in fact have a cause which you previously argued was impossible since something literally will not come from nothing) was intelligent.
Let me give an example.
Let's say you have a watch. You take each and every piece of that watch apart. Every gear, every screw. Then you put all the pieces in a box. No matter how much you shake that box, you will never get a watch.
Same with us as humans, who are even more complex and fragile than watches.
You have very intelligent humans. Let's say you take each and every piece of that human (building blocks of life) and you put it in a void. Now no matter how much you blow up and shake that void, you will never get a fully developed human.
An intelligent being, cannot come from an unintelligent creation.
Now it's supernatural too? Why would I assume the intelligence that caused the big bang (assuming an intelligence was the cause) would be supernatural or even have meant to do it?
Because this force would have to break the laws of science/nature, giving it the title, supernatural.
Also strangely nothing that points specifically to yahweh. Even if I assumed you were right about there being a god you would still have all your work ahead of you to prove that it is your god.
It's one thing to prove there is a God, and another to prove that God is Yahweh.
Now, I could never give 100% evidence to prove any of this, because God gives us questions, we cannot answer, to test our faith, because only by faith can we make it to heaven with him.