I don't think there's a significant number of people who believe in a specific simulation scenario the way so many people believe in a specific religion.

Sure, some dumb tech bros believe “i think we live in like, a simulation, dude”, which would correspond to “there must be some higher power out there for sure”. Both beliefs are irrational, but more likely than “the Matrix is real, just like in the movies” or “this specific codex got it all right and we should live our lives after the thousands of unclear moral teachings that can be extrapolated from it by untrustworthy human preachers”