Ben Buchanan deduces that J.K. Rowling must be a Christian because the Harry Potter books only mention celebrating Christmas. Ramadan and Hanukah are not celebrated at Hogwarts. Buchanan's father is a minister. I noted these points because Harry Potter books are some of the most frequent targets of book challenges in public schools and libraries. There are many reasons given for wanting the books banned. One of them is that they promote witchcraft. This is the reason often given by fundamentalist Christians. To find out more about this read "Harry Potter and the Ministry of Fire". Clearly Buchanan and his family are not of this ilk.
To find out more about book banning and censorship see my Banned Books Page.