I like maps. I especially like interesting maps.
What you see below is not the latest information, but I'm sure the data has not changed much since these maps were put together. The first map shows dominant religious groups by county in the USA in the year 2000. I was a bit surprised to see how Catholicism is so prevalent in a "Protestant" country (click directly on the map to view it in detail).
The second map shows the dominant Protestant denominations by county. My denomination (SBC) really is in the South. In fact, its northern border runs relatively close to the Mason-Dixon Line. Having grown up in New York State (not city), I'm not surprised to see the Methodists being the largest group there. Unfortunately, the liberal UCC is the largest group in liberal New England.
I've added a third map just to remind us of our duty to "make disciples of all nations."