A church using deadly force? That’s not Christian at all. And it would bring every jackbooted thug within 100 miles.
Much better a viral video showing the police beating down the church door, manhandling passive parishioners into the paddy wagons, and surrounding the building with SWAT goons while they ransack the parish office.
That would create millions of allies. Mass rallies would follow & the po-po either arrests them all or backs down.
This isn’t North Korea. Yet.
Or you could just use deadly force and make the police so terrifed that they simply refuse to enforce the subpoena. Self preservation trumps all.