A friend sent me this link:
Harry Potter and the Inklings: The Christian Meaning of The Chamber of Secrets.
I should note in advance that this is an essay by John Granger, who wrote
Looking for God in Harry Potter and
The Hidden Key to Harry Potter. As the name of the essay suggests, Granger argues extensively that Rowling is following in footsteps of earlier Christian fiction writers, notably CS Lewis. (For those who don't know, "The Inklings" was the name of a group of Oxford writers, including Lewis and Tolkien, who would meet regularly at a pub to discuss what they were writing.) Just thought I should give that heads up so readers have an idea what to expect.
Really worth a read when you have some time; it's got a lot of food for thought. (But it's a long essay.) The analysis of Chamber of Secrets, the book that supposedly has clues to the half-bllod prince and the ultimate ending in it, is particularly interesting.
As a bonus, the essay contains Granger's guess as to the person on whom Guilderoy Lockhart was modeled. (Rowling has said that Lockhart is the one character based on someone she knew/had met.)
FWIW.