Simple. Witchcraft in the Bible is an attainment of power through dealings with dark creatures and unholy pacts. Witchcraft by way of a genetic trait is simply using your God given abilities, it's not different that athletic ability or natural musical skills. In the world of HP wizards are born, they manipulate the world around them even before knowing anything about it, it's just there. In the books before Harry finds out he's a wizard he's constantly running into issues because of his powers, he hates the haircut his aunt gives him and his hair grows back overnight, a window at the zoo just disappears, things fall down for no reason when he gets mad. That's Harry Potter world magic, no spells are truly necessary (the spells they learn are really just mnemonics to help them focus their will towards the desired effect), no alliance with dark forces, the magic just happens.
THere's a lot of other stuff going on with the story of Lot's daughters. And it turns out they were wrong anyway.
***Witchcraft by way of a genetic trait is simply using your God given abilities, it's not different that athletic ability or natural musical skills.*** - discostu
"Dr Kurt E. Koch an expert on the Occult writes: Black magic is distinguished from white magic by its form. In the worldwide literature of magic, it is maintained that black magic is done by the help of the devil and white magic with the help of God. This definition is false. White magic is just as dependant on the powers from below as is black magic. The evidence is not difficult to find. The effects of white magic are the same as those of black magic. In white magic the three highest names are used for these evil ends. Usually a magic charm is added to the three highest names, taken from the Six and Seventh Books of Moses or from another book of magic." (Occult ABC p. 135)
http://www.letusreason.org/Current28.htm