Visual History of Religions

This looks like a good potential teaching resource. History of Religion: "How has the geography of religion evolved over the centuries, and where has it sparked wars? Our map gives us a brief history of the world's most well-known religions: Christianity, Islam, Hinduism, Buddhism, and Judaism. Selected periods of inter-religious bloodshed are also highlighted. Want to see 5,000 years of religion in 90 seconds? Ready, Set, Go!"

See also an animated gif version.