i invite the teens and 20 yearolds inside, especially the jehova's witnesses, ask them to define their god and wait for them to admit their definition of god changes with what they want it to be. some believers are have a completely ambiguous, these i can tolerate alot longer, its the ones that will start telling you your life is meaningless unless you believe like them that i ask to leave immediately. i feel like i've made many of them better proselytizers. one girl said to me, image a world perfect without any crime or sin, that's what heaven is like, no evil. i responded telling her that without evil then good would take its place, you cannot know what good actually is without evil. this made her quiet and she would come back a few times to discuss theology(like a year since the last time i saw her) i think she left the church because the conversations got more and more about factual basis than faith.
some of them can be reasoned with, especially when you treat them like adults, but some of them have no reason at all, so theres no point in reasoning with them. why use logic on someone who doesn't believe in logic, or accept it?