Back in the early days of Christianity, going right up to the medieval periods and certainly the 1400s in England, people could gain sanctuary in Churches. You ran onto consecrated ground, and no matter what, no-one was allowed to take weapons onto the holy ground to hurt you. That lost principle seems beautiful, and based right in the heart of Jesus' pacifist message. But there's a difference between 'don't incite violence' on Church ground, and 'protect innocent people'. In areas were direct threats have been made against Christians or the Church, proportinate measures such as discreet security guards or friendly random searches of bags and coats seems to only protect the Church. Of course, the agreement of the congregation would also be needed.