A Christian Religious group who preach to people by knocking on doors.
Yes they might be annoying, but they believe they are helping people, so give them a break. If you ask them not to call ever again they wont, thats all it takes.
I know some and they are lovely people, and the horrible things people say about them hurt, needlessly.
I havent been brainwashed and im not deluded, im just not disrespectful to people or beliefs i dont know about.
Some Jehovahs Witnesses called and sounded interesting so I started a bible study with them.