I never got the impression he had a hidden camera on him, but who knows. I think he was just a "true believer" that went with the hard sell approach though he was still pretty polite the entire time.
About the only time he raised his voice in an aggressive manner was when several people were speaking over him and each other, and he shouted
"Look, if you don't accept Jesus as your personal savior, you're going to hell and that's all there is to it!"