One of the joys of studying religion is how much high-quality data are available. For the latest “wow, that’s cool” source of data, check out this interactive map of religion in the United States. Put a cursor over a state and you see the religious distribution of its population. Want to see trends by region? Just move your cursor slowly across groups of states and watch how the bars change.
Thanks David Mimms and Kyndria Brown for the link.