I went to a wedding not long ago, held in a church that I think is Pentecostal, certainly is happy-clappy "charismatic" evangelical in it's style. The preacher took the opportunity to "reach out" to the wedding guests who weren't members of his congregation, and went all-out to convince us of the love of God that was sweeping through the room, and that those who failed to heed this were damned. I didn't feel anything other than cold and uncomfortable; not only did I feel the fire and brimstone aspect of his sermon was highly inappropriate for a wedding, but there was something about the man's body language and tone that was eerily familiar, and that made me very unsettled, but I couldn't put my finger on what it was.
Then, for an entirely unrelated reason, I came across this excerpt from Leni Riefenstahl's "Triumph of the Will" - http://apolyton.net/showthread.php/174737-Hitler-s-speech-Triumph-o...
I got cold chills watching it. The same intonations, the same gestures, the same crests and reliefs in the rhythm, and I had an odd feeling that you could have swapped "seig heil" for "amen" and no one would have noticed the difference. I'm the first to admit I have almost no experience of evangelical or charismatic preaching, so I have no idea if this is a one-off coincidence, or is it more common than that. It would make sense that evangelical preaching shares similarities with Hitler's speeches - both seem to be sound and fury that is emotionally catchy enough that the lack of substance and the logic holes simply aren't noticed.
I'd be interested to know what others think, who have better experience than me in this area.