[Don John de Austria]

Real magic (aka witchcraft/sorcery) involves making bargains (a la Faust) with the powers of Hell in exchange for power here on Earth.

No such bargaining occurs in the Harry Potter stories.

Therefore, there is no real magic depicted in the Harry Potter stories.

The Christian faith speaks only against real magic.

Therefore, there is nothing in the Harry Potter stories to which a Christian should object.

[~EagleNebula~]

It is your choice to make, and you may choose to justify it any way you like.