Nice theory, but you're missing the point.
These simulations must have had makers, makers more advanced than us.
So no matter if the universe is an advanced hologram or other piece of machinery, or an actual universe. Someone or something must have created it. Something that existed before the simulation or the real thing ran. Most likely something outside of our dimensions.
It's very likely that heaven is somewhere outside our 4D world, say heaven is 5D or even higher.
Is it so weird to call the creator of this reality (or simulation) our god? For whoever wrote the 'program' wrote the rules, would that not make him able to bend the rules at will? Performng miracles in our eyes? He can even change the rules permanently.
The universe is like an advanced computer program, we are part of it, god is the programmer, as well as the PC manifcturer. The angels are system admins and the devil and his demons are crackers.
I'm missing what point? Whose point? Your point?

One could call the simulation programmer/s gods, why not. Doesn't get you anywhere though and I shouldn't think it would gain any favors from the programmer/s any more than an ant in a colony within a tanks on a childs desk.
To assume gender (he) in the programmer/s is assumption on your part.
The programmer/s would probably not be answering "prayers" but they may take notice or wind back to a system backup if we destroyed our biosphere because we fucked up (nukes, nanotech, bioweapons etc). Our time is the system tick of the simulation, if the simulation were paused, fast forwarded, stopped, rewind, etc then the simulants would be unaware.
A simulated universe would probably be fairly simple code (describing fundamental quantum laws) running on a very fast system, think "computronium".
everything "emerges" from it following the evolutionary process. It's not like our bodies are designed in a 3D modelling tool, instead it's more likely that we are complex "self aware" cellular automata. The evolution process itself would still be "real".
Another point that upholds this theory is the fact that Self correcting code structures (ALA Claude Shannon information theory) have been found at the heart of quantum mechanical laws, It seems these codes underpin the very fabric of our reality:
https://www.youtube.com/watch?v=q1LCVknKUJ4