They spoiled it for us.
But if you're serious^H^H^H^H^H^H^Hrational in your inquiry, you'll come to discover that, like Santa Claus, God does not exist, at which point you will also reject the inquiry. All of it.
The simulation argument, linked to recently here, I believe, has much the same features without the religious baggage: there is no experiment you can do which will provide direct evidence that you are, or are not, in a simulation. In the extreme case, the simulators could just stop the sim, back up, and change the outcome of the experiment (or just your perception of the outcome), and continue on.
However, it might still be important to your future survival whether you act as though you are or are not in one, in either case.
Still, there are some definitions you might offer for God that I'd agree with. And your conclusion would be to reject the existence. Mine would be to ask for better a definition.