That's exactly why we're tired of simulationism. Short of the simulation runners talking to us, it's impossible in principle to take the least step toward figuring out if it's true or false.
I mean not exactly... It depends on the type of simulation we could be in. If we're in the type that is monitored and if we could find a way to mess with the simulation that we'd just be rolled back to a previous state, then yes, it's impossible. If instead it's watched about as well as some of us monitor our own VMs, well, maybe a different story. Of course we're still a long way from many things in physics like a theory of everything, so no need to worry about being in a simulation at this time.
> People just can't let go of wanting some kind of God
The reverse is also true. While the inability to determine why the laws of physics are there is not evident that there must be some reason that they are there, one can conjecture a causal relation with some kind of entity that affected it. Either that be God, or the playful intern that happened to create UniverseSandbox#9971
We can observe the laws of physics as it applies to the universe, but why they are there is far less clear, something we may never know.