Can Witch Doctors Cast Spells on Christians?

Many in Africa, Haiti, the West, and various other parts of the world believe that witch doctors are powerful. Various ones have succumbed to the point they believe Christians can be cursed by them. The Bible opposes the use of witchcraft and casting spells as Deuteronomy 18:10-12 shows. Does the Bible suggest witches, palm readers, and witch doctors could be real? Is it possible that witch doctors can cast spells on Christians to blind them to something? If not, why not? Are non-Christians subject to be blinded by Satan, his demons, and those involved with the 'dark arts'? What does the Bible clearly teach? …