So many kids in my insular Christian community growing up had mom’s that accidentally got it right.

They weren't really right. Christians weren't running around burning The Chronicles of Narnia series, despite C. S. Lewis being just as big a liberal dweeb as Rowling. They were just upset that Rowling had replaced all the classical Christian symbology and morality with secular knock-offs.

Christians bagging on HP are no better than Red Sox fans complaining about toxic Yankees sports culture.