Wicca, a decentralized religion considered part of contemporary paganism, is experiencing a resurgence among young women, said Chas S. Clifton, editor of The Pomegranate: The International Journal of Pagan Studies and author of several books on the subject. “In the ’90s, you had ‘Buffy the Vampire Slayer’ and ‘The Craft’ that popularized it,” Mr. Clifton said. The progression, he said, was natural. “It tides well with the feminist movement happening and internet culture popularizing it.”