This is terrifying. Thank fuck I'm not in the US. I already get anxious when some random knocks on my door. If they started spouting off about praying for me and my family I'd be weirded right the fuck out.
Granted, I love my physical privacy. I generally don't answer the door to plain cloths unless I'm expecting someone. My 5 year goal is to move outside of my current town and have no neighbours. Preferably with a nice long driveway that I may install a gate on at the road.