Outside of JW I would say there is a lot of cult like tendency in the charismatic movement and pentacostal sphere of things
Particularly the word of faith movement and prosperity gospel which deviates greatly from orthodox Nicene beliefs. It its preached by people like Kenneth Copeland and Joel Osteen and also Trump's white house faith advisor. A lot of mega churches are associated with it.
Any group who are strong believers and enforcers of the old testament ,Westboro baptists and Conservative Christians who can't tell the difference between conservative values and Christian values apart.
Hard to discern what cult actually is, either among Christians or in general. There were and are many tiny groups of christians, some are really dangerous, but lately it is rare for them to be dangerous to people outside unless they try to indoctrinate them. There is some sort of "family" somehow named branch that attracts new member by sending young ones to mate with them and then converting them through sexual and "love" relationship.
Westboro goes without saying. It’s basically a one person attempt at onslaught. There isn’t a denomination more involved in witness protection, which I know as I’m in a town right now where witness protection dumps their people. To the credit of JW’s, they are a peaceful group, despite being at odds.
At least the JWs will come out and attempt to debate you. I have no love for the Watchtower Society however.
But the Young Earthers claim vast conspiracies, some of which don't even make sense (see: anything by Koshej) to preserve a literal interpretation of the Old Testament (or less, for the Young Earth Jews). Imagine being caught up so hard in a lie you think it's actually true. That's the very definition of being deceived by the antichrist!