This neighbor sounds too trigger happy. Some people, no matter what religion, are nutters, and kill people for no reason.
I feel for you and I am sorry you and your area have to put up with this jerk.
Do you have a Councilman, or Mayor to write to or email.?
What about your area State Representative. Tell him what you told us. That the local density of people is growing, and you are afraid someone might possibly get shot or killed. Is it possible to find out someway, to see if his guns are registered, or do you have something like homestead rights and on your own property you can have any kind of arsenal you want?
Is it possible this man has been in jail and should not even have one gun?
Do you have any town ordinance for quiet time that he might be violating?
---> If you go the KHall route, I might see a Lawyer first and have the Lawyer write the letter to the KHall and not put your name on it, just be "the client". Say that this man is not a good neighbor, not a good Christian man, and say he also used profanity in addressing you. Possibly, say, you were interested in learning more about JW.org but this man and his family are such poor examples of their faith, you don't want anything to do with a religion that would have those hypocrites in it.
I do know how irritating it is when you want to enjoy a summer night and you have to contend with neighbor noise.
LoisLane