How modern pagans are reviving the polytheistic religions of the ancient Greeks, Druids, Egyptians, and other civilizations. This year, Andrea Berman will watch the Olympics for the first time in her life. But she doesn't care who will jump the highest, run the farthest or swim the fastest. She'll be watching the games—being held this year in Greece, their ancestral home—for any mention of Zeus, Athena or Apollo. "I will watch it to see if anything even remotely resembles anything I would know as an ancient ritual and tradition," Berman said. "But I kind of have mixed feelings. On one...