Few organizations or movements set out to deceive, but without the kind of attention to careful dividing of the full counsel of God, and true Bereanship on the part of actual or potential individual believers, it can happen. And this can happen to an individual believer as well, whether he or she is part of a movement or not. May that be a constant admonishment to each of us. Our real adversary is not people.
"For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places."