" 
 ::::::John, I think that is a fair summary of the sources you have provided. In the absence of others on the point of contention, the reference to the William Kay source is good as it acknowledges that aspects of membership were considered cultic. I am happy with the edit, though it may later need to be changed, if a source clarifying or detailing the rather vague ""widen and loosen"" part comes to light.  "