Mormons are really into guns on the whole. There's an entire fundie Mormon clan (the Kingstons) that own Desert Tech, an arms manufacturer. Mormons in general have a very high rate of enlistment in military services, while the Amish are pacifists and opposed to any form of modern technology. And don't forget that you have the Deseret Nationalists that are quite willing to murder for their religion.
I think you mean "blood atonement", not "blood libel". Blood libel is about Jews (supposedly) killing Christian babies. And yeah, those are the DezNat people.