Q: How can you be a magician and a Christian at the same time? Isn't magic condemned in the Bible?
A: According to magicians, I am not a magician (which is fine to me). However, the words don't come in a vacuum, they aren't empty in its meaning and purpose (Ephesians 5:6). There are substantiated reasons why magic is condemned, but not because of the word itself, but because of its purpose and mind behind it. Otherwise been a doctor or lawyer can also be wrong at some point, but is not because the word is given empty, but because of the intentions some may put behind. So yes, I believe magic may be wrong at some point depending on how far they take it.
Let see an example, (Deuteronomy 18:10-13):
There shall not be found among you anyone who makes his son or his daughter pass through the fire, or one who practices witchcraft, or a soothsayer, or one who interprets omens, or a sorcerer, or one who conjures spells, or a medium, or a spiritist, or one who calls up the dead. For all who do these things are an abomination to the LORD, and because of these abominations the LORD your God drives them out from before you. You shall be blameless before the LORD your God.
As you just read, magic is condemned because of the activities executed. So yes, if we go that route, then magic is wrong and condemned, not because is effective, defective or inefficient, but because of the reasons, deeds or violations behind those actions regardless the results (whether it works or not).
I believe that sorcery, witchcraft, calling the dead, etc. are condemned, not because it is real in results but because is real in actions. People are making fools out of themselves and trying to make fool others too, and these disingenuous activities not only could be physically risky but also they could be emotionally consuming for something that is not real. If God doesn't want us to worship idols, is not because idols are real, but because you are deceiving and consuming yourself into a nonexistent entity. So, when God condemns something, is not always because it could be real in result (because sometimes they aren't), but mainly because they are real in action and God doesn't want us to be deceived on things that are not real.
If sorcery, witchcraft or talking to the dead were real in results (which they aren't), then, that would take the ability and capacity to control God or the Devil at their own whim (which is empirically impossible). My point here is the opposite and aware people of that as well.
I want to show illusions as an honest art, by teaching people how things work and not as a denigration of other people’s intelligence by trying to fool them.
No one is exclusive to the knowledge of this craft and everyone should be able to learn it, even more, if they want an answer. If people want to sell it, they are free to do so, just keep in mind that this is a place of free market and competition (as any other business is).