Do you believe witchcraft is wrong and that God hates witchcraft?
The Bible says,
10 "There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch,
11 Or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer.
12 For all that do these things are an abomination unto the LORD: and because of these abominations the LORD thy God doth drive them out from before thee.
13 Thou shalt be perfect with the LORD thy God." (Deuteronomy 18:10-13).
So if one is fantasizing about things (like witches or witchcraft) that God hates, then one is not having the mind of God but they are having their thoughts and focus on a sinful things that is an abomination unto the Lord.
In the Old Testament (not the New Testament), the punishment for witchcraft was death.
"A man also or woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones: their blood
shall be upon them." (Leviticus 20:27).
However, God has not changed his mind mind on sorcery leading to destruction in the New Testament.
After this body dies, there will be a judgment followed by the Lake of Fire for the wicked.
"But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death." (Revelation 21:8).
However some might say, "But it is just fantasy and I am not doing it, so it is okay, right?"
I would say, "Wrong."
How so?
Well, Jesus says that to just fantasize about having sex with a woman is the same of committing adultery but it is committing adultery in your heart.
27 "Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
29 And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
30 And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell." (Matthew 5:27-30).
Meaning, one is play fantasizing about sinful things in their own mind, God treats that as being the same as committing the crime itself. Meaning, it can condemn a believer.
John says that if you hate your brother, you are like a murderer and no murderer has eternal life abiding in him. So the sin of hate is similar or like unto being a murderer. It is where murder can start. We see this in the story of Cain and Abel. Cain was wroth or angry at his brother in the fact that he was doing the right thing that God commanded of him (i.e. a religious zealout?) and Abel was killed by his own brother.