The thing is, is that the mainline Christian religions (and I consider Catholics mainline for this purpose), are losing adherents in droves. That is why the Catholic percentage in the US is gradually drifting down despite the huge influx of Hispanics, and even though the Catholic figure is inflated somewhat because I suspect there is a particular high percentage of CINO's (Catholics in name only). So the mainline belts in the US have a particularly rapidly growing percentage of the "unchurched."
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Excellent point. I don't have data, but even here in the Bible Belt, lots of non-Baptists are increasingly unchurched. For whatever reason, Baptists are supremely effective in getting their folks to remain strong believers, through and through, even if they don't ever go to church as adults. Catholics seem to have the opposite situation where a lot of folks go to church and then return home with more willingness to think critically. Probably because Catholics stress reasoning in their dogma ( even if I don't buy a lot of it), whereas fundies are all about faith. Perhaps this should be the Baptist anthem
http://www.youtube.com/watch?v=lu3VTngm1F0&ob=av2e