From a chum who has arrived at the same conclusion:
Well, the PBCC are not a mainstream church, but apparently they qualify as a mainstream cult...
The Effects of Religious Cults on the Health and Welfare of Their Converts
HON. LEO RYAN OF CALIFORNIA
IN THE HOUSE OF REPRESENTATIVES
Thursday, November 4, 1977
"All of the groups that we are talking about have living leaders who are demonstrably wealthy. The beliefs of all these cults are absolutist and non-tolerant of other systems of beliefs. Their systems of governance are totalitarian. A requirement of membership is to obey absolutely without questioning. Their interest in the individual’s development within the cult towards some kind of satisfactory individual adult personality is by their doctrines, very low or nonexistent. It is clear that almost all of them emphasize money making in one form or another, although a few seem to be very much involved in demeaning or self denigrating activities and rituals. Most of them that I have studied possess a good deal of property and money which is under the discretionary control of the individual leaders.
Most of the cults of concern consider themselves purely religious; some others appear to be more political. One of the most important of the common properties of such cults is the presence of a leader who, in one way or another, claims special powers or may even allow himself to be thought of as the Messiah. Such leaders do have special personal qualities, including a unique worldview and special willingness to effect drastic changes in the thinking and behavior of followers."