It’s the Jehovah’s Witnesses.
Here a list.
1. Amish
2. Mormons
3. Quakers
4. Salvation Army
5.Masons
But it couldnt be Muslims. That is the religion of peace after all and would even think about killing people without cause. After all, 9-11 was only a plot by the evil and stupid Bush Goverment to seize power and not hold elections for President.
No, no, no.
Spin-off Mormon polygamist sub-cult.