In 1851 the French historian and philosopher Ernest Renan announced to the world that Islam was "the last religious creation of humanity." He was more than a bit premature. At about the time he was writing, the Bahai faith, Christian Science, Mormonism, the Seventh-Day Adventists, and a major Japanese religious movement known as Tenrikyo were all just coming to life. Falun Gong and Pentecostalism--both of which now have millions and millions of members--had yet to emerge. Whoops.