First of all, Buddhism hasn't been proven wrong yet either so I am mildy offended that we don't seem to matter.
Secondly, aren't you just precious you darling ignorant child? Witches have been around sicne the time of the ancient greeks, AND WERE ACKNOWLEDGED as an actual religious sect: the followers of Hecate a female god whose primary function was related to nature and the energies thereof.
In the modern era, a witch refers to followers of Wiccan which is also a religion if a minor one. Officially they're wiccans, but some practitioners will still call themselves witches in a sort of dig at the Christian community who has collectively believe they were actual witches in the early days.