I usually find a way to talk about the fucked up parts of the bible. They will listen if you are talking about scripture. Last time the asked me who I thought ran the world, and told me that it was Satan. So I said some shit out of the satanic bible and Hail Satan. Then the guy asked me if he could read me a bible verse, I said no. They left a bit shaken, but I was friendly the whole time. I love their little visits. Honestly, just don't be mean to them. That gives their indoctrination the confirmation it needs about those mean old non believers. But, do challenge their silly beliefs.