This is the problem with Americans. They know very little about the devil. Consequently, they are easily deceived by cults who claim to believe in the Bible. Unless, America returns back to its heritage of the Bible, I'm convinced that many more cults will pop up in America. If you think that the Heaven's Gate cult was strange, you haven't seen anything yet.
Christians are the only ones who have the power to stop the cults.
First of all, the Christian church should start teaching their people the truth of the Bible. It's time that she quit preaching tradition. Cults will point out the inconsistencies of Church teaching. They do this by pointing to doctrines that are man-made. There is so much man-made teaching in Christian circles.