I don't just see this warping tendency in Tolkien criticism either. There are Catholic commentators who need Shaekspeare or Lewis to be crypto-Catholics in order to enjoy them. There are Protestant scholars who need Dante to be a proto-Protestant before they can enjoy him. All of this seems to be a natural human tendency: we want people we like to agree with us; we want the things we enjoy to validate our core beliefs. The problem comes when this causes us to put aside our commitment to Truth and the genuine love of neighbor that comes with it.
I remember hearing Lewis' stepson, Douglas Gresham, speak. One of the things he said about the Inklings that struck me was that they profoundly disagreed with each other on almost everything and yet could still be friends. He went on to say that we've lost that ability in recent years; more and more now, to disagree with someone seems to mean that we have to hate them. If what Gresham said is true, then we should expect to see the kind of warping I described above become more and more prevalent. If we find ourselves liking something, we will need bend it as much our own way as possible in order to feel justified in continuing to like it.
In light of these things, then, I feel the need to say that Tolkien spoke truely when he said that The Lord of the Rings was a deeply Catholic work. I am not a Roman Catholic. There are places Tolkien goes where I can't follow, but I will say this: Middle Earth could not be what it is were it not for Tolkien's conservative, Tridentine, Roman Catholicism. If I would honor Tolkien and love my neighbor as myself, then I have to honor that fundamental truth about Middle Earth and not fudge it. The same goes for other authors I love but disagree with: Robert Heinlein, Homer, Frank Herbet, Aeschylus, Ursula K. Le Guin. If they're living authors, then I may hope for them to be won over to my point of view; that's fair game. The point is, that they must come as real people of their own free will, not as bits of wish-fulfillment in my own musings. Looking back at my own bits of literary criticism, that's really hard to do.