Historically, women accused of witchery were singled out due to certain physical features (disproportionate fingers, ginger hair - which is an exclusive European trait amongst people of Celtic origin, even beauty was singled out to be "deceptive") that made the enemy (church) accuse them of devilry and evil. In addition, many were practicing herbalists and healers, who used natural remedies to help the sick - which the enemy system taught of as evil. Funnily enough, by culling such women, the black plague started to reign in Europe, decimating over millions of people who were blindly reassured that faith in Jewsus and the Bible were enough to save them.
The above basically shows you how Christianity was used to attack and slander the uniqueness among the European and instill illiteracy + superstition into the minds of the average peasents (whose kind compromised more than 90% of total population in Europe in those times).