So you're talking about proving the nonexistence of something. In a mathematical system, that's not uncommon. You assume it exists, but that leads to a contradiction. Therefore it doesn't exist. QED.
But outside of mathematics, ChatGPT (with some editorial modifications) points out the obvious:
"You cannot prove that something doesn’t exist anywhere in the universe because you’d have to exhaustively search all of space and time — a practical impossibility.
However, you can prove that something doesn't exist under certain conditions or within a specific domain."
So I should be able to tell if this "God" exists
in my vicinity. What would I see? What unambiguous test or finding would show such existence?
What do you mean by this "Creation"? What process is involved? Does some "Being" act to bring the Universe into existence? Or is this just some poetic notion that you can only explain with other poetic notions, and you really don't know WHAT it means?