You will have just as much right to call yourself a Witch. Many chose this path, either from choice , or because of their isolated location. They may call themselves a Solitary or Hedge Witch. It is used for ritual purposes and to project energy, never for cutting. The Athame is a very personal item, you should never touch a witches athame, without first obtaining their permission.
Witches are sensitive, intuitive people who work with the cycles of the moon.
They are in tune with natures cycles in the form of the eight seasonal festivals of the year. They worship and reverence the Goddess and the Horned God, and have a deep regard and understanding for the mother earth and nature. Witchcraft includes a magical element, so Witches' cast spells using a wide variety of techniques and materials, but always obeying the wiccan rede . It gives the Witch a sense of freedom and greater ability to project energy without the restriction of clothes. The simple answer is no, but an explanation of this requires an understanding of the difference between Wicca and Christianity.