Marvel23, I'd suggest the big test between a religion and a cult is choice.
Can you choose to join and learn, but later choose to stop and leave.
Most religions and cults welcome new entrants, so part one's ok.
But when you consider leaving, then the trouble starts.
Oh, and whilst in it, the intensity of change is a good test also.
Many religions have been around for quit
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Coercive Persuasion and Undue Influence