Not according to James Bowman. They and numerous others create what Bowman dismissively refers to as “fantasy art.” And fantasy art isn’t Art.
It always surprises me when I run across them, but I have to acknowledge that some folks just don’t like J.R.R. Tolkien. Shocking, I know. The Lord of the Rings. The Hobbit. The Silmarillion’s mythopoeic tales. What’s not to like? Great works of art and creativity, right? Well, they might be creative, but they do not qualify as Art.
If I recall both Tolkien and Lewis faced similar criticism about their “faerie-story” works.
That said, the greatness with them as with Shakespeare was the fact that their faith permeated their work. Shakespeare and Tolkien both being Catholic and Lewis an Anglican (almost Catholic though).