First of all i would like to give props to all the research done to start this thread...
Now I would like to say that there could be so many meanings to this book, and I do truly believe there is more to Harry Potter than just a really detail and twisted story about a young wizard coming to age.
I am firm believer of a greater meaning in everything...
The Holy Grail idea really stirs me...perhaps harry potter is book of the thoughts on life and faith...fueled through WWII allusions carried by wizards...where does the holy grail come in? The Holy Grail held Christ's blood, becoming The Cup of Life.
I'm not sure there is a huge conspiracy in the Vatican concerning the Harry Potter books, since the Pope has deemed them non-satanic or pagan or whatever...I think its just the fact that witchcraft is a non christian religion and to The Church that is being pagan since it does not worship GOD.
I'm Catholic in the means that I was baptized and reconciled and given my first eucharist and confirmed...yet I'm not sure if I'm really Catholic
I'm just Christian...I believe what I want to believe...no, actually I believe what my heart tells me is right...if you are up to the challege to see my beliefs, read The Last Battle by CS Lewis...brilliant
anyways back to Harry Potter, i think it is entirely possible that a holy grail theme or at least a Christian theme could be present...
as a future writer I know my works convey my beliefs and feelings through other things, and JKR is brillant enough to want to do this...