Not the person you replied to of course, but when I saw this the concept of mystery religions comes to mind for me. https://en.m.wikipedia.org/wiki/Greco-Roman_

Not the person you replied to of course, but when I saw this the concept of mystery religions comes to mind for me. https://en.m.wikipedia.org/wiki/Greco-Roman_mysteries https://en.m.wikipedia.org/wiki/Greco-Roman_mysteries They were even widespread in the same region at the same time.