Witchcraft is a work of the flesh, and God views it like He views adultery and murder. As such, it should have no place in the life of a believer.
Many people turn to fortune tellers, psychics, and horoscopes for hope. Faith in this hope (false hope) has ruined countless lives.
Witchcraft, magic, and other similar practices are very lucrative. In fact, the love of money is at the root of this evil just as it is all others.
There are always two spirits at work: the Holy Ghost and a satanic or false spirit. Witchcraft comes from a satanic spirit and opposes God's Spirit.
Those who meddle with astrologers and sorcerers (and like practices) put themselves on a collision course with God's judgment.
Seeking counsel or instruction from spirits or from the deceased is a wicked practice and demands God's righteous judgment.
Most men would rather accept lies than to believe the truth. This bias against the truth has been present as far back as the garden of Eden.
Men could know the truth if they desired to know it. Sadly, most men refuse to pursue and know the truth made so readily available unto them.
Believers can strengthen the hands of the wicked by approving of their works or remaining silent concerning their God’s view of those wicked works.
Sin causes a man's strength to fail. On the contrary, "the way of the LORD is strength to the upright." Man's choice to sin will eradicate his strength.