Your title is correct, being a Roman Catholic writer myself. I’ve heard various Catholic groups praise Tolkien and other Catholic fantasy writers as something wholesome to read. This is for some Catholics a way to get around the moral complexities of “magic.”
But I’ve noticed people will always look at us Roman Catholic writers as something to question and/or praise. Even F. Scott Fitzgerald’s body was initially refused a Catholic burial because he wrote the Great Gatsby. Roman Catholics are not mindless minions of the Pope. We are individuals with our own free will.
How much or how less did Tolkien’s Catholicism play in his writings? We ultimately will not know. Nor does it matter. We should appreciate the works based on the writings themselves, and not the writer. It’s the story that matters most. That’s why Tolkien wrote it.
That’s my two cents on this issue.