Thanks for putting this up Mike. This kind of stuff always fascinates me, and I have visited upon Glenmary's work before, and appreciated it.
The percentage of adherents figures look bogus to me. Given for example that about 12%-13% or something of the population is black, then that 1.6% for Black Protestants means that only about 15% or so of the blacks are Protestants. Really? The Catholic percentage of 38% or so also looks way high. It might be closer to 25%. Maybe the issue is that "adherents" really means "congregants," and those who claim an affiliation, may not be members of any congregation, and far more Catholics tend to be congregants than blacks. Or something.
Oh, my favorite map which I can't find anymore, was the one where the largest plurality of a religion was put up by county excluding Catholics, which reveals the underbelly of many of the underlying divides in this nation, and its history. Suddenly, upstate NY becomes a Methodist belt (the distant echoes of the Great Awakening which had its epicenter up there to start and was John Wesley driven, with so much heat that part of it broke away and fueled Mormanism), and you get to see where the Germans settled by the Lutheran belt, and some oddities in West Virginia, and a few holdout Presbyterian counties in PA (I think Altoona in whatever county it is in might be one), and so forth. I even think the Episcopalians show up in Greenwich.
