Alright, so what? What good does treating them petulantly do? If you cannot treat them in a way where they feel understood and cared for they don't change. If you treat someone poorly or like you are superior they are more likely to double down on their belief and spit in your face. Unless your aim is to bash their faces in and straight up use force you have to see the human in them to get started reversing the programing because a lot of religions preach that unbelievers are evil and the first step in any questioning of the whole is to show that no... You aren't evil. You are moral and kind actually.
What's the end goal of disrespect? To be rude to them for fun?