If we are living in a simulation, it is a simulation of atoms, or quantum fields, or perhaps something deeper behind that. That got started with enormous energy in the form of hot dense quark gluon plasma. From there the rest follows.

It is not a simulation of humans.

We have zero indication there are rules at a higher level than the quantum or gravity. Like rules on what you ought to do in the bedroom.

Also earth nor humans were created by intelligence, just like how mineral crystals or fjords are not created by intelligence.

Hence we must conclude that bronze/iron age religions and maybe living in a simulator are not the same thing.

For the rest of this question of a creator, we cannot know, anybody claiming to know anything beyond "perhaps" or "maybe" is a fool, or will win a nobel price. By lack of the latter the rest of us will assume the first.