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I was not saying that the Bible defines what a cult is. But people (christian) who identify groups as a cult use The Bible as their source in labeling a group as a cult.
No, a cult is a group, belief system or way of life that centres, mostly, around one person who is pushing a particular product, or ideology.
So a pop, film or sports star who advocates veganism, alternative medicine or anything else can have a cult following. Like Gwyneth Paltrow and Goop or celebrities who swear by anti-ageing products, for example.
In religious cults, people become convinced that they, alone, have the truth and that anyone who says otherwise is dangerous and trying to disrupt the group's belief or way of life.
Christianity started as a Jewish cult. Jews knew they were God's chosen people and were awaiting their Messiah, then suddenly Jesus of Nazareth comes along, heals people, criticises the religious establishment and people follow him and say that he is the Messiah. After his death, his followers even start saying that he is alive again - and that those who believe in him can become God's children. Jews used to persecute us for being a cult.
Christian cults are those who claim they follow the Bible and Christian faith but don't because their own leader has told them otherwise. So "Rev" Moon claimed that he had met Jesus who told him the Moon had to become the 2nd Messiah because Jesus had failed in his mission. Is that true?
No, because the Bible says otherwise.
JWs, Mormons etc. do not believe in the Trinity because their leaders tell them it's false. IS it false; no, the Bible teaches it.
Several cults have actually been found guilty of brainwashing - e.g. JWs have been known to let their members have as little sleep as possible, cut them off from their families and friends and bombard them with teachings by their leader. Why? So the members will be unable to think and question for themselves and will not be in contact with people who present an alternative argument to the group.
Flat earth teachers are just as capable of having a cult following, and indeed presenting cultish behaviour, as anybody else.
The Bible does not teach this kind of controlling, coercive behaviour.