For now there is no 100% scientific proof of God existence, but I believe even science will lead us to God existence.
Cause and effect exists in everything. There is no pure random. The thing we call random or probability arises from our inability to see tiny details, like which molecules move a leaf as it twists in the summer breeze.
Cause and effect are like programming. Cause and effect all by itself almost proves that God exists, and programed everything to be what it is.
When you add complexity and entropy to the way things exist and operate, the only way they could exist and operate is through God. If God didn't exist, none of the universe would exist as it does.
None of this explains what God is in detail. We can draw some conclusions about the nature of God from science and observation of nature. But the details are limited without direct revelation from God, Himself.
Whatever brought the universe into existence, no matter what form or qualities He has, It is still God.

if I had a nickel for every time BADecker mentions "cause and effect" and "entropy" without fully understanding the concepts of them I'd be a millionai... Oh wait I own some bitcoin.
Nice.