Quoting LumpySpacePrincess:" Las ttime one of them came to my house I asked them how they felt knowing that their religion states ... [snip!] ... more people into their religion, effectively lowering their chances of actually getting admitted. They never came back."
You are talking about Jehovah's Witnesses. It doesn't work like that. 144,000 go to heaven to assist God, while the rest of the loyal followers live on Earth when it's restored.
Most the time if you are kind but straight forward and to the point they will leave. Make it known you do not wish for them to come back. Being subtle won't help you here.