That should be a very easy claim to prove, actually. If someone really were the sysadmin of the universe, they could easily do a wide variety of impossible things that anyone can could verify. For example, they could write their message in the sky with a special kind of photon that magically violates the laws of physics in an obvious way (say, for example, it interacts with all elements normally except one which it inexplicably doesn’t interact with at all). Or find/replace their message into the genome of a designated species. Or graffiti it onto every large surface in the world simultaneously.
Of course, there would be no way to distinguish a proper sysadmin of the universe from someone who had gotten root access improperly, either from the simulated universe, the parent universe, or some other universe. And this does raise a problem for any direct evidence in support of a religion—no matter how strong the evidence gets, the possibility that someone has gained the ability to generate arbitrarily much fake evidence, or reliably deceive you somehow, will always remain indistinguishable; so anything with a significantly lower prior probability than that, is fundamentally impossible to prove. Most or all religions have a smaller prior probability than the “someone has gained magical evidence-forging powers and is using them” hypothesis, and as a result, even if strong evidence for them were to suddenly start appearing (which it hasn’t), that still wouldn’t be enough to prove them correct.
That should be a very easy claim to prove, actually. If someone really were the sysadmin of the universe, they could easily do a wide variety of impossible things that anyone can could verify. For example, they could write their message in the sky with a special kind of photon that magically violates the laws of physics in an obvious way (say, for example, it interacts with all elements normally except one which it inexplicably doesn’t interact with at all). Or find/replace their message into the genome of a designated species. Or graffiti it onto every large surface in the world simultaneously.
Of course, there would be no way to distinguish a proper sysadmin of the universe from someone who had gotten root access improperly, either from the simulated universe, the parent universe, or some other universe. And this does raise a problem for any direct evidence in support of a religion—no matter how strong the evidence gets, the possibility that someone has gained the ability to generate arbitrarily much fake evidence, or reliably deceive you somehow, will always remain indistinguishable; so anything with a significantly lower prior probability than that, is fundamentally impossible to prove. Most or all religions have a smaller prior probability than the “someone has gained magical evidence-forging powers and is using them” hypothesis, and as a result, even if strong evidence for them were to suddenly start appearing (which it hasn’t), that still wouldn’t be enough to prove them correct.