I make a point of being friendly to everyone who comes to the door on a religious mission. Even if I just say, “I’m sorry, I can’t talk,” they can see from the houseful of children trying kill one another that it’s not about them, personally.
I find the diligence of JWs and Mormons impressive, and I wish more Catholics were open, if not so regimented, in sharing their faith with others.
Teh friendliness is good, but I think you misunderstand about the diligence part. They are driven to go door-to-door. The JWs even have to report to their local congregation how much time they spend doing it each month. And they don’t do any of the works of mercy that Catholics do. They don’t give to charity. They limit family size so they can spend more time going door-to-door. They don’t operate hospitals or schools or food banks, etc.