That sounds like the Morman boys. They all do their service time on bikes or on foot, no cars insight. Did he try to leave you an Awake or Watchtower magazine?
When my daughter was 13 she was home alone and answered the door to the Witnesses. She knew better than to tell anyone she was alone. So when they asked if mommy or daddy were at home she said her dad was upstairs cleaning his gun. She said he was already in a bad mood and she hated to bother him. They left in a big hurry. Her daddy wasn't at home and we didn't own a gun.