Religious Maps

I saw this map recently.

It's a map of which religion is dominant in which region. You look at it, and some unsurprising facts appear: the South is Baptist, Utah is mormon, and there are Lutherans in Minnesota.

At first, you think that Catholics are everywhere. But when you look at the index of maps, you find this one, the overall map of religiousity on an absolute scale. And you realize that while Catholics are the most numerous, they don't form a majority in Oregon. (You can also look at the map of Judaism, and see how they are where you expect, even if they never outnumber the Catholics.)