In many "fundamentalist" churches today, invading the church, especially looking like terrorists, is likely to get them shot. After all, how are the Church Militia to know that they only intend "disruption", when they come running in looking like that? Shoot 'em first, figure it out later. Otherwise one day your church will be the scene of a real terrorist (or wacko, but I repeat myself) attack.
Wearing masks and carrying an axe?
Shoot em. Period.