The twentieth century has seen a remarkable revival of "the Old Religion," as adherents of Neo-paganism call the native religious traditions of Europe and tribal traditions from North America that predated Christianity. Many neo-pagan groups identify with Celtic (Druidic), Egyptian, Native American, Norse, or Roman traditions; others with modern science-fiction motifs; and still others with witchcraft. Neo-paganism is occultic in nature. A central figure in much of Neo-paganism is the Mother Goddess, who has been introduced and worshiped among certain feminists even in some mainline Protestant churches.