Not all magick is witchcraft. Prayer is magick. Church is ritual. Faith healers? Hello people.
Christianity is not against magick, it is against certain types of magick.
In the original translation of "thou shalt not suffer a witch to live" the word "witch" did not mean "wiccan". Wicca had not been invented yet. The word translated to something more like "necromancer"
Yes, Christians believe the dead should be allowed to rest in peace, not pestered with magick. There are other magicks which are forbidden by the rules of Christianity.
The concept that Christianity is against all magick is completely false. Sadly, many Christians don't know this. Also many Christians don't know that not all magick is witchcraft.
I hope this helps.