Going out like that is the right thing to do.
Acting like a crazed apostate just lets them think that you are a tool of Satan. That won't get them to think.
Acting rational, yet refusing to meet with them lets them know that they aren't in control of you anymore. They really, really hate that. And in the end it might make them actually think about the silly cult they are in at some point.
Don't DA. Don't meet with them. Let them do their dirty work on their own. You never know, they might just let it go.