Twelve Tribes is considered a cult by their misinterpretations of the Scripture with such things as Replacement Theology thinking that God has replaced Israel with them. This is far from the truth, God still has a plan for Israel and that are, and always be His people. They believe that they are the only ones that will enter heaven.
I am doing some research on them and want to find out more
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"Cults," Sects, and "New Religious Movements"