Annoyed

I am beyond annoyed with these damn Jehovah Witness people that walk around my neighborhood trying to recruit people to their church. I refuse to answer my own damn door anymore and I have to keep my front door shut and locked because they come almost daily. They ask if I have a bible every time and I tell them no I'm not religious and I don't have a religion but now I'm starting to regret that answer because they won't go away. How is this not considered harassment? I don't want to waste my time in your church. It's annoying me. What can I do about it? I don't want to be rude and run them away but I want them to kindly know I'm not interested. They have come 3x this week already.