God is the one who produces proof. The universe is the proof of His existence. If you won't believe the universe proof, you wouldn't believe a selfie or ATM card and PIN.

It works only if you believe that the universe was made by your god.
It all depends on the definition of a god.
Some facts to consider, even if we assume the universe was made by a god.
It was a 13 billion years ago and that being ceased to exist.
The universe was made by this being , but then evolved by itself, which doesn't make you his intentional creation. He created matter and billions of years later some part of this matter made your neanderthal ancestor. In such case should you really be praying to a god that probably doesn't even know he made you and doesn't care. Just like you don't care what bacteria will grow on the shit you flushed yesterday.