I do hope people realise that the
Landover Baptist Church is a totally fictitious parody of the religious right-wing fundamentalist Christianity of the US Bible belt...
Not too extreme a parody, I'm afraid. The church where I play music has a similar take on HP. The "magick" portrayed is satanic because only Christ was allowed to do miracles (despite his recommendation to his disciples that they would be capable of greater feats) and, of course, because of the whole "not suffer a witch to live" episode earlier in that series.
An approximate summary might be that there is One True Way and any other way must come from Satan. Teaching children that there's a school where you can learn this spell-casting stuff might actually encourage children to learn this, and other, stuff. Yeah, that's a bad thing if the children in question grow up with an uncertain moral fortitude. But to discourage wonder and thought is wrong, in my view, and also, if I read him correctly, in the Christ's view.
And that doesn't take into account that "satan" is a concept, not a person, meaning (approximately) "choice" (which might be called "uncertainty", particularly in cases of moral fortitude) and is intended as a reference to the conflict we have with ourselves before deciding how to behave, usually under extreme circumstances or duress. Satan's overt characterisation in Job and in the Temptation scene are the basis for most people imagining it as a Being (I'm side-stepping what I think of as the drug-addled portrayal by John in Revelations).
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Cowboy and Indian films/books were racist (wittingly or not) so Westerns had to go out of fashion. Now we have Humans and Aliens instead, which is ok cos Aliens aren't real. When we watch the Alien series or War Of The Worlds or (gawd help us) Starship Troopers and Independence Day, we're allowed to revel in their obliteration, and our genocidal tendencies are sated.
I don't know HP - half-watched one film, never read the books - but I doubt the "racism" is much more horrific in them than in the the average space shoot-em-up, which we all, of course, love.
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Famous gay couples in fiction: Batman and Robin, Holmes and Watson, Wilson and Crick, Morecambe and Wise, Hope and Crosby, good gawd, y'all, does it matter? If it isn't on the page, then it's your imagination (literally) - and that goes for authors' as well. I suspect that Ms Rowling has an active fantasy life that she hasn't yet published. So do we all. Personally, I like when ladies kiss.