What do you think of this scene?

I'd just sit there and watch, more than likely laugh about it. Doing that is like asking for trouble, after you left that guy probably got his @$% beat. Now let me ask you, how would you feel about a devil worshiper coming to your church and preaching? Some of your fellow christians would become angry and possibly violent. Every body has the right to believe whatever kind of crap they want, even you. It's disrespectful to try to always tell people they're wrong when you have no proof.