This is very serious. A cult is a group that manipulates and takes advantage of people, an anti-cult is a group that helps people recover from a cult. They have their own beliefs? Sure, so do you and me and everyone else. Do they coerce anyone to accept their beliefs? Do they exploit people’s vulnerabilities for their own gain? Do they respect basic human rights like freedom to dissent? Do they blackmail people that is trapped in to make them disclose their private lives, that they have no right to know much less to judge? Do they harass people that leave the group in any way? If you think about it, it is not so difficult to distinguish one from the other.
If they talk about Jesus and the Trinity is because jws despite calling themselves Christians are anti-Christians. Exposing that doesn’t make you a cult. What someone chooses to believe is his/her personal decision, stepping in someone else’s personal rights is not. Not respecting somebody’s personal conscience goes high on the list of cult traits.
About the therapist that had to stop helping people, that goes beyond cult or not cult, it is just criminal.