Being a genuine "witch" involves a lot more than just what you're saying. If you're referring to Wicca, well, they have a whole set of belief systems that are antithetical to Christianity. I personally have never seen the appeal in it because it presents a spirituality that it's adherents know to be false, yet they enjoy the social aspect of Wicca (i.e. Meeting other Wiccans) and believing themselves to have some control over the world, what with casting spells. And yet in typical postmodern fashion there is a "do no harm" rule. If you are in a religion that has the primary purpose of serving yourself with a connection to nature, spirits and spells, then how long can you go without harming another person to get what you want? Doing no harm doesn't just mean no physical harm.
Forcing someone to fall in love with you, for example. That is harmful to the affected person, assuming it works, because that person is being forced into something they might not want.
And on that subject, God instructs His followers not to dabble in witchcraft, which you have admitted to doing. The reason He says this is because when we do something like that, it's not always harmless fun--assuming that such magic is possible, you are consulting spiritual forces outside of God that are likely malevolent in nature even if they do not appear to be, and we humans are not supposed to have the sort of power that self-professed witches might try to harness, even if they have good intentions.
