Religion in America

I found this chart of religious belief by county. Before anyone writes in, there's a few things that bother me. First of all is that the percentages are based off of adherants of "religious bodies that participated in a study by Association of Staticians of American Religious Bodies". Even assuming no bias, I don't think that attendence in church / temple / what have you can be considered an accurate gauge of belief or, for that matter, non-belief. I also don't like the granularity of the results and the numerical divisions seem odd, to me.

Be that as it may, this does, more or less, match my expectations, for whatever that's worth. I suggest taking it with a grain of salt but I find it interesting, all the same.