lots of people have had weird/odd / non-mainstream beliefs.
Soothsayers of old searched for 'signs'.. what does it matter - these are oddballs not "cults"
I guess Scientology is more of a cult based on the little I've heard of people not being able to leave
but otherwise these are not cults
Mormons and JWs are not able to leave without drastic consequences. Plenty of religions are like that. Radical Islam to name one of them.