Yes, he did say that his plot is about wizards who worship the god Yahweh from the Old Testament and maybe the scriptures he spread out all around his Hogwarts are indeed not christian because they are from the Old Testament before the Roman Empire rewrote it into the New Testament however he did spread CHRISTIAN symbols such as roman crosses, a christian chapel, a christian priest, and that cursed chapel chore EVERYWHERE, these are definitely christian even if the scriptures are from the original jewish religion before the Roman Empire rewrote it and turned it into roman christianism.
Maybe J.K.Rowling is indeed christian, which is to be expected from such a puritan woman who invents a closed hidden world who lives in margin of the rest of the world like a sect, I stopped respecting J.K.Rowling many years ago already so I don't care what she is nor what she wants because she sold her creation to Hollywood and didn't give a shit what Hollywood made of it as long as she was paid a lot of money, however some biblical quotations on tombstones don't make her books some christian books and when I play a porn game to experience sexy life in Hogwarts, I certainly don't want to see religious symbolism everywhere, listen to teachers and students turned missionaries who preach some religious bullshit, be lectured by a priest, and hear chapel chore everywhere because Hogwarts is not a church, it's a witchcraft and wizardry school, it is not supposed to overflow with religion, that's not what Hogwarts is supposed to be even if J.K.Rowling is christian, she didn't design Hogwarts as a religious school so if he does want to make a religious school then he makes his own and doesn't bait players with a popular school which is NOT religious and turn it into a place of religious proselytism.
THAT's what really grinds my gears: his cowardly unassumed hypocrite proselytism that he doesn't even acknowledges even though it is obvious.