As a Wiccan Priest of the Celtic Tradition I believe that I am qualified to answer your question in detail. Magic works, whether you want to believe in it or not. If you believe in God and his bible then there's no reason why you shouldn't believe in magic, as the bible says several times that magic and witchcraft exist. If it wasn't real then God wouldn't call it an abomination (Btw: I used to be christian before converting to Wicca, so I know what I'm talking about when it comes to christianity). If your friend doesn't believe then that's on them, but black magic, voodoo (voudon would be the religion) or any other form of magic does exist and is very real. Love spells, money spells, curses and hexes, spells of healing and destruction, its all very real. Of course, in Wicca we prefer to stay on the lighter side of things and work our magic for good, however, Wicca is a nature based religion. And nature herself has both positive and negative aspects so why not explore both the positive and negative aspects of magic. That is in no way promoting black magic, but one philosophy that Wiccans teach is balance. So why not balance the light and dark sides of magic? As for the person who claims to be Wiccan then claim that Wiccans aren't Witches really needs to check their history. In 1999 the "Witches Council" (a group of High Priests and Priestesses from nearly every major tenet and tradition of Wicca) came together and adopted the term "Witch" as their own. So I guess one who is Wiccan has a choice to call him/herself a Witch, but the term does belong to Wiccans. Someone who just practices magic without a religious affiliation can call themselves a Witch if they wish, but a member of Wicca would not see them as thus. I hope this answers any and all questions. If you have a problem or question about anything I've said please feel free to message me back or email me at [email protected] and I'd be glad to respond. I stand by the Goddess in everything that I do so I stand by what I've said here. Blessed be in the Name of the Mother Goddess.