OK, so let's put it this way.
Does God exist in the same sense as unicorns?
Or does God exist in the same sense as the sun?
Or does God exist in the same sense as the number 2?
We still can't know how God exists, or even would exist, if God exists. Why are you finding this so difficult to accept?
WE DON'T KNOW. WE AREN'T GOING TO KNOW. NO ONE ELSE CAN TELL US. The question of God remains a question. And will remain a question. Looking for evidence and not finding it doesn't mean anything. The question remains exactly as it was. And so do the endless possibilities that it embodies. So the question to you is: are any of those endless possibilities of particular positive use/value to YOU? Could they be?
Theology begins, here ....
I agree that we don't know. Given the circumstances of our present existence, there's no way that anyone can possibly know with any degree of certainty. I don't think we're at a stage where we can even begin to "look for evidence," since the very concept of God remains indefinable and indescribable - other than symbolic representations in literature and fiction.
At least with unicorns, we have some sort of artistic conception so that if anyone did spot one, they could say "Yep, that's a unicorn." Other people could also confirm it. But there's no record of that ever happening. If it's a creature that's said to exist on earth, then the earth has been sufficiently explored by now that if someone ever did spot a unicorn, we would have heard of something.
But with "God," we don't even know what we're looking for. Even if we did find "evidence," we still may not have sufficient knowledge to make sense of it or confirm it as reliable. If we're talking about some kind of entity which is large enough and powerful enough to create an entire universe literally from scratch, then it could theoretically be some entity which exists outside of our dimension and plane of existence.
If so, it would be practically impossible to even produce one shred of evidence which we could examine or confirm on our current plane of existence. In the end, it's all just a big "maybe." Maybe this, maybe that - but no hard evidence, no direct knowledge. It's all just guessing.
Theology begins with guessing. Not that there's anything wrong with that. There's nothing wrong with considering all the possibilities.
But theology seems like it goes beyond that. Even if we get beyond the question of whether or not there is some kind of "God" who created the universe, theology also tries to attach some meaning or significance to it, to humans specifically. Theology often tries to attach a certain necessity or urgency for an individual human to find "God" and to accept that there is meaning, significance, and purpose in one's life (even if we don't really know what it is).
That's what theology does. It's not just a matter of considering possibilities. Maybe there is some extra-dimensional being far beyond our comprehension who created the universe for some particular reason. Maybe. But even if that's true, what does any of it have to do with us, here in this tiny little corner of this immense thing known as the universe?
That, for me, is when theology tends to go awry. It's one thing to operate from the assumption that "there is a God," but then to pile more assumptions on top of that is when it starts to go too far.