"Barna may not even be a very good pollster, at all. He is respected among Protestant Christians primarily because is the only pollster to specialize in Christianity, and because he uses extremely charged, Protestant-sectarian definitions. For instance, he frequently phrases questions in such a manner that few Catholics would ever answer "yes" to, and then uses those questions to establish that those who answer "no" to them deny central teachings of the Catholic faith, such as the infallibility of the bible.
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Interesting, and I think you may be right, at least to a degree. He definitely has a bit of a fundamentalist orientation. I'll have to think about that when I look at his polling.