If God exists, then she must be an atheist
Let's strip away the religion, scripture, etc... and start off with the immutable laws of physics. I personally agree with Hawking that the laws of physics came from nothing and nothing can violate those laws. But for the sake of argument (and to be facetious), let's examine the notion that a God created the laws of physics which culminated in the big bang and after 15 billion years, us. Such a being would not believe in a higher power. Otherwise that being would no longer be God. All this being would believe in is its own existence and the sequelae of the laws of physics ie. the universe. This being would have to be an atheist no different from us. We accept our own existence and the universe governed by physical laws.
So, if God exists then we should welcome her with open arms (and open legs maybe?) to Rational Responders as a fellow atheist.