Christianity: what is the lowest common denomination?

There are hundreds of different types of this religion. I am interested to know what contemporary denomination you think is the most problematic in terms of theology and activity. Personally I would put the Catholic Opus sect on a fairly high priority for being disbanded and it's members locked up in an asylum but that is only my opinion.

I place my vote for the Southern Baptists...

Well, most Christian sects really to seem to frown upon Jehovah's Witnesses and Mormons. Nor do they consider them Christian.

Fundamentalists

The rest of the Christians in the world are mostly OK. Seriously. As an atheist, fundamentalists are the only ones that are psycho and are only found in the US (Unless they influence other nations).

Mormons.

Firstly the Catholic Opus sect is a different group to Opus Dei.
Fundamentalist Christians often seem to rile up other more than other though

None, Jesus came as a teacher and not The Terminator. If I have disagreement with another Christians views and the person is willing to discuss it I would argue my points, but I would not judge them as horrendously false.

In Judaism it is the reform one. Personally I would put the reform sect on a fairly high priority for being disbanded and it's members locked up in an asylum but that is only my opinion.