You can't "prove" scientifically that God exists because that would require him to be physical, visible. He is outside of his creation, although he can and has entered into it.
You can't know that. You can say the same about the flying spaghetti monster instead of God and boom there you have it, now the flying spaghetti monster is the creator and you will never be able to prove it or disprove it because he lives outside time and space and its not physical.
Now you are bringing religion into it. The FSM isn't shown by science proof at all. Probability the scientific proof that God exists leaves open the idea that God might be the FSM. That is the failure of scientists in their observations, so far.
We are so far from scientific knowledge about what God is like that, revelation from God is the only thing that we have that can show what God is really like.