Just so you know, LOTR is not a parable, allegory, or anything else (other than a really good story). Tolkein was adamant about that. He intended the whole Middle-Earth cycle (Silmarillion, Hobbit, LOTR, etc) to be a substitute for the body of mythology that England never had (having been basically erased by the Normans). Yes, he was a strong Christian, and his storys reflect his point of view, but they are not anything more than storys.
"The Lord of the Rings as “a fundamentally religious and Catholic work.”
J. R. R. Tolkien