So if there was a petri dish world that was a pure simulation of this one, only it had no real god or gods except the many simulated gods within it, what would happen if you had the ability to watch it from above while hitting the fast forward button to scan through the centuries. Would this simulated world in fact emerge in much a similar way to the way our world did, would the various religions extend and retract to reach states of greater homogenization over time? Would it end up the same way every time even with simulated gods? You can be an atheist or theist to philosophize on this, it is only a simulated world I'm talking about.
Interesting thought experiment, but ...
In a simulated world a simulated god would look real. I guess you don't mean simulated gods but imaginary gods that only exist in the minds of the simulated people?
I also assume that the simulation has an element of randomness because there would be no reason to run the simulation multiple times if it were deterministic.
My guess is then that, over a large number of simulations, a general law could be found that the belief in a god can't be stable. Even if one group of believers killed all of the other believers, sooner or later they would split. As there is no objective method to establish the nature of an imaginary entity, people (or simulated people) will disagree on the nature of the god and form a new religion/denomination/cult.
Just as we see it in our (real or simulated?) world.