Not witchcraft or spells as they're described in the Bible. It's a genetic trait in HP, these people can do these things from birth, all they learn is how to control it.
I didn't intend to get involved (really) in this aspect of this thread. But, well, I can't help myself.
How is witchcraft by way of "genetic trait" any different from the Biblical view of witchcraft?
Are you familiar with the story of Lot's daughters? Apparently, these young ladies believed that sorcery had something to do with genetics otherwise they wouldn't have shagged their dad.
Oh, so they do conjure spells and use witchcraft.
Is the source of their power Almighty God?
If not, then it is witchcraft. It doesn't matter if they claim "nature" gave them the power (although apparently they still have to conjure, it doesn't come quite so naturally as you claim).
There are curses, charms, and spells in the Harry Potter books.
That's WITCHCRAFT. The only good power we can have must come from Almighty God and be used for His purposes. It's not used for our own selfish aims (like wanting to hide from your teacher, or to steal something from another person).
It is Satan who wants people to believe that they are the source of good, as opposed to Almighty God.
I know you're trying to claim that Harry and his friends are the "good guys" and their opponents, the OTHER wizards are the "bad guys". So it is okay for Harry to use magic because he is doing it for "good" reasons. If Harry and his friends quest to accumulate more powers, it is for "good" reasons.
But you are calling what is evil, good.