I don't see any republican christians defending themselves with guns. I don't see any need for them too. I see them intimidating folks with them sometimes.
Self defense gun use is very common. Not only against criminals and bad guys, but against panthers, coyotes, alligators, and other things trying to eat your kids, pets, livestock. Also is symbolic of an armed citizenry that wants RESPECT from their govt servants.
That's NOT the jihadi reason for "intimidating" people with a gun. Or a bomb vest. Or a severed head. If you don't understand the difference, you lack any sense of self-preservation or common sense.
For Americans, the Gun is merely a tool and the Bible is an inspiration. And they really have NO connection. Other than being important cherished FREEDOMS worth protecting.