Wikipedia, the Difficulties of Mapping World Religions, and a Most Bizarre Map

In teaching the global geography of religion this term, I have again been disappointed by the quality of relevant maps that are readily available on-line. Making a map of this sort is admittedly a challenge. Many areas contain multiple faiths, and a few religions—Mahayana Buddhism, Taoism, Shinto—even allow their own adherents to follow other religions simultaneously. Degrees of religiosity and …