In my London days I was plagued by doorknocking evangelists.
In the end I kept their literature.
When the JWs knocked I said "You must read the Book of Mormon, the truth lies therein".
When the Mormons knocked I pressed the Watchtower upon them.
All visits stopped. They have a database!
The Korean Evangelists came round and I gave them a Buddhist text
They get confused! Rather like my MiL.And Mrs Nick's Aunt, who is some sort of secular nun and is quite poisonous!