Actually, I would think that no matter what the religion is, where it originated, who it worships, etc. etc., there will always be worshipers. I mean, just look at the church of the flying spaghetti monster.
There really is no such thing as "made up" and "real" religions. Anyone can worship anything. It would make just as much sense to worship the Greek god of culture as it would to worship the first baloney sandwich ever made. Really no limits in that sense.