Their behaviour shouldn't really be a surprise........look at all those nutbars on TV on Sunday mornings! Hoopin' and hollering and screaming "Hallelujah!!" and "Praise Ja-E-SUS!!" over and over again..........look at that moron Benny Hinn. He gets up there, pretends he's got "the Spi-rut" and "heals" people ........then it shows people in the audience crying and "fainting" and "praising the Lord"..........it's all just bullshit.
My gread grandmother used to be a Penecostal and the church she went to was indeed how you describe it. People rolling around, thinking they've got "the Power" and other total insanity..........you're generally dealing with people who are emotionally disturbed IMO. It's all just a big money grab...........they never show you on TV, the collection plate being passed. Benny Hinn, for example makes over a million dollars A WEEK from his "preaching"...........from your description, it sounds like that episode on The Simpsons when The Movementarians come to Springfield.