I read anti- (Roman) Catholic propaganda every day. It is best known as the Bible! It clearly resolves the question of the worlds' largest cult, know as Roman Catholicism...
... The cult leaders need to make you believe that there is no where else you can go and still be saved, and if you ever leave the “one true church” then you are going to hell. This is a fear based control mechanism designed to keep you in the cult. It also gives the cult leaders tremendous power over you. If you really believe that leaving the group equals leaving God (or means you are leaving your only chance to succeed in life), then you will obey the cult leaders even when you disagree with them instead of risking being kicked out of the group. Exclusivism is used as a threat, it controls your behavior through fear.
Be very suspicious of any group that claims to be better than all the others. A religious group may say that other groups following the same religion are OK, but they are the ones who have a better grasp of the truth and they are superior to the rest. This is often just a subtle version of exclusivism. ... -http://www.howcultswork.com