I saw this mentioned in a post. I thought it deserved a thread of its own. I liked how this article reasoned with the reader how a religion can cross over into cult territory very quickly.
"The harm stems from a system that shuns and ostracizes adherents that don't accept their exclusive claims to truth. That is where conventional religion becomes a potentially harmful cult. Forcing people to conform by using the subtle threat of social alienation is a form of coercion."
"Any religious community can become a cult. It's not about how faith is expressed in a community but more importantly how people are treated if they want to leave and disbelieve."
Full article here:
http://www.huffingtonpost.com/eliyahu-federman/when-organized-religion-become_b_3996139.html