The ultimate way to insult another person's religion or belief system is by labeling it a cult.
While some religions or belief systems can be labeled a cult because they do in fact abuse and isolate their members, or encourages it's members to engage in dangerous actions and behavior, for other religions and belief systems it's not warranted because it's really not like that at all.
Recently a Dallas, Texas pastor and Rick Perry presidential supporter Robert Jeffess said in an interview on CNN that Christians should not vote for Mitt Romney because he is a Mormon and that the Church of Jesus Christ of Latter-day Saints is a Cult.
The mainstream Mormon church has been around for about 180 years are so, and is very well established around the world, so I think we can stop labeling it a cult.
Pastor Jeffess is part of the Southern Baptist Convention, and if anyone knows about the Southern Baptists, then you know that they tend to look down on anyone who do not share their religious or political beliefs (kinda cult like in my opinion).
With the exception of them occasionally coming to my door and trying to get me to convert, I really have no problems with Mormons.
They have never tried to use fear tactics, they've never tried to get any money from me, and the
Mormons that I have worked for were all nice and paid in full.
While I have no desire to convert and become one of them, I'm certainly not going to label them as a cult, and I'm certainly not going to not vote for one of them simply because they don't share my beliefs.