What is a witch?

A witch above all worships the Triple Goddess and her Consort, The Horned God, in one form or another. A Witch works Magick within a definite code of ethics. A Witch acknowledges and uses the male-female polarity in his/her rites. A Witch takes total responsibility for her actions, herself, and her future.

Do Witches worship Satan?

No. 'Satan' or 'The Devil' is an 'evil' aspect of Christianity. Wiccans do not believe in divine good nor divine evil, as divinity is always reflected through each individual. The unfortunate claims that the male aspect of Wicca (usually in the form of The Horned God of the Wild) is the same as the Christian Devil, is a good chunk of the reason why many Christians and others harshly persecute and ridicule those of The Craft.

Can a Witch also be Christian?

No. Craft folk believe in a beneficient universe, the laws of karma and reincarnation, and divinity inherent in every human being... where-as Judeo-Christianity incorporates concepts such as original sin, vicarious atonement, bodily resurrection, and divinity inherent in the Godhead alone. Besides, you'd have to ask how serious a person who practiced two religions was about either one. Being Jewish is an exception, since it is a race and culture as well as a religion. There are many Wiccan Jews, but they practice Wicca, not Judaism.