Is the South Still a Cultural Region?
Click here for a larger version of the map (as well as lots of other great maps) -- the red states above represent counties where Baptist churches outnumber any others; the black dots are where they outnumber everything else [thanks to Seth for the correction of the original post].
A full accounting of the map above, and numerous related ones about other regions, may be found in the 8-volume series Religion by Region, edited by Mark Silk and Andrew Walsh. The summary interpretive volume of that series has just been published, and I'll blog on it later. The volume Religion and Public Life in the South, published a couple of years ago, is reviewed by our own Darren Grem here.