The Moonies, for instance, mix Christian and Eastern influences. There is no true average. Cultic relationships can exist in groups as small as two or as large as hundreds of thousands, if not millions. To the individual who meets up with either, it doesn't matter. Small cults tend to be more physically and emotionally abusive, largely because their size ensures that they don't appear on the media's radar screen.
Large cults can psychologically damage hundreds of thousands of people.
Wealthy organizations like Transcendental Meditation, Scientology, and Rev. Moon's Unification Church can also influence legislation and elections. Noted psychologist Dr. Margaret Thaler Singer, author of Cults in Our Midst, estimates that 10 to 20 million Americans have been involved to some degree with cultic organizations in the last 20 years. Here are links to hundreds of groups that critics or former members have alleged are cultic. Cult critics by and large are not concerned about issues of doctrine. If you believe that Christ was an alien, that's fine by us.