Didn't Tolkien specifically say that LotR was not written as a Christian allegory?
Edit: Taken from
here
"In his last interview in 1971, Tolkien plainly stated that he did not intend The Lord of the Rings as a Christian allegory and that Christ is not depicted in his fantasy novels. When asked about the efforts of the trilogy?s hero, Frodo, to struggle on and destroy the ring, Tolkien said, "But that seems I suppose more like an allegory of the human race. I?ve always been impressed that we?re here surviving because of the indomitable courage of quite small people against impossible odds: jungles, volcanoes, wild beasts... they struggle on, almost blindly in a way" (Interview by Dennis Gerrolt; it was first broadcast in January 1971 on BBC Radio 4 program "Now Read On?"). That doesn?t sound like the gospel to me. When Gerrolt asked Tolkien, "Is the book to be considered as an allegory?" the author replied, "No. I dislike allegory whenever I smell it."
Thus, the author of The Lord of the Rings denied the very thing that some Christians today are claiming, that these fantasies are an allegory of Christ?s victory over the devil. "