Pagan John Roesch of Wheat Ridge conducts a ritual. (Evan Semon, Special to The Denver Post) Give them that old-time religion — ancient religion — and then watch an exploding population of modern pagans give it contemporary twists. Their numbers roughly double about every 18 months in the United States, Canada and Europe, according to the Ontario Consultants on Religious Tolerance. Neopaganism, whether a careful reconstruction of ancient practice or a completely modern interpretation of ancient lore, is now among the country's fastest-growing religions. People, especially teens, are rejecting what they see as the "autocracy, paternalism, sexism, homophobia and...