Religion v Cults

Its still not easy to draw the fine line between some religious denominations and cults other than numbers, historical acceptance and longevity. However there seems as though there should be more than this - How about an obsession with converts, the intimidation of those who have left the cult/religion and the irrationality of the worldview? While all three adjuncts need not be met it does appear that if all the boxes are easily ticked off one ought to be concerned.