The Bible is clear about magic, it is very wrong in God's eyes:
(Deuteronomy 18:10-13) . . .There should not be found in you anyone who makes his son or his daughter pass through the fire, anyone who employs divination, a practicer of magic or anyone who looks for omens or a sorcerer, 11 or one who binds others with a spell or anyone who consults a spirit medium or a professional foreteller of events or anyone who inquires of the dead. 12 For everybody doing these things is something detestable to Jehovah, and on account of these detestable things Jehovah your God is driving them away from before you. 13 You should prove yourself faultless with Jehovah your God.
(Leviticus 19:26) “‘YOU must eat nothing along with blood. “‘YOU must not look for omens, and YOU must not practice magic.
(Acts 19:19) Indeed, quite a number of those who practiced magical arts brought their books together and burned them up before everybody. And they calculated together the prices of them and found them worth fifty thousand pieces of silver.
Where to draw the line? You should talk to your mum about Narnia and ask her to justify this. At the end of the day fictional or real, magic is magic in God's eyes. It's not a game or something harmless to mess about with. The reason God hates it so much is because it's not from him, rather from Satan the Devil and his demons. You may now be asking 'What is demonic about Bewitched or Jeanie etc?' but the Bible also states:
(2 Corinthians 11:14) . . .And no wonder, for Satan himself keeps transforming himself into an angel of light.
Something that looks harmless can in fact be the opposite. Just because it's packaged up as something cute doesn't mean it isn't harmful.
This is an extract from the book What does the Bible really teach?
To mislead people, the demons use spiritism. The practice of spiritism is involvement with the demons, both in a direct way and through a human medium. The Bible condemns spiritism and warns us to keep free from everything connected with it. (Galatians 5:19-21) Spiritism does for the demons what bait does for fishermen. A fisherman uses a variety of baits to catch various kinds of fish. Similarly, wicked spirits use different forms of spiritism to bring all sorts of people under their influence.
One type of bait used by the demons is divination. What is divination? It is an attempt to find out about the future or about something unknown. Some forms of divination are astrology, the use of tarot cards, crystal gazing, palmistry, and the search for mysterious omens, or signs, in dreams. Although many people think that practicing divination is harmless, the Bible shows that fortune-tellers and wicked spirits work together. For instance, Acts 16:16-18 mentions “a demon of divination” that enabled a girl to practice “the art of prediction.” But she lost this ability when the demon was cast out of her.
The Bible tells us both how to resist wicked spirits and how to break free from them. Consider the example of the first-century Christians in the city of Ephesus. Some of them practiced spiritism before becoming Christians. When they decided to break free from spiritism, what did they do? The Bible says: “Quite a number of those who practiced magical arts brought their books together and burned them up before everybody.” (Acts 19:19) By destroying their books on magic, those new Christians set an example for those who wish to resist wicked spirits today. People who want to serve Jehovah need to get rid of everything related to spiritism. That includes books, magazines, movies, posters, and music recordings that encourage the practice of spiritism and make it seem appealing and exciting. Included, too, are amulets or other items worn for protection against evil.—1 Corinthians 10:21.