Um. You said:
That is what I'm arguing against. Saying there were none before him is equivalent to saying he was the first to write them. Which is wrong.
And yes. He was by far the most popular fantasy writer of the century. However, the bookstore did have fantasy sections before him. All things fantasy were in the fairy tales section. With the evolution of the English language (and yes, the popularization of Tolkien, no doubt), 'fairy tales' came to mean 'children's stories,' and the genre was split up.
It should also be noted that Lord of the Rings didn't catch on in America until the sixties, and bookstores had fantasy sections long before that.
In my first post I didn't say Tolkien was first. I said everything comes from Tolkien. I should phrased that differently.
You make a very good point about fairy tales, Grim and Mother Goose. That's fantasy, and that didn't occur to me.
If book stores had a fantasy section, however, it was for children, it wasn't the advlt oriented fantasy section you see today. Yeah, LOTR got popular in late '52, s and took off in the 60's. I do not believe there were "fantasy" sections that weren't dedicated to children (and so called), however. For one thing, most of the material wasn't even written yet.
I was born in 1967, so I didn't visit any bookstores until the late 70's, so I guess I could be wrong. But I know allot about the genre and writers and novels, and material that was published a novel before 1960. I can think of very few. I don't remember being enough of it to fill a section (of novels) devoted to heroic fantasy. Especially if you separate it from science fiction. And even including science fiction, the vast majority of stories saw publication, not as novels, but as stories in magazines. Those were in the magazine section, and not a specific fantasy section of novels.
I believe that the 20 foot long (or larger), 3 bookshelf high (or more) of only fantasy novels...novels not magazines...I do not believe that phenomena occurred until AFTER LoTR gained popularity, and had been popular for at least 10 years. Mid-70's.
Now, I'm belaboring this point about "novel sections" because that signifies the explosion of the fantasy genre...the novels, not the magazines. The novels caused the games (D&D), which caused the movies, which caused the computer games. And Tolkien was the spark that lit that fire. And no matter how much gas you pour out, how much wood it's poured on, the fire want start without the spark. That makes the spark the most important part.
I never said there was no fantasy before Tolkien, because I know better than that. I've mentioned several works that came before Tolkien already, and including science fiction, there is also Frankenstein, Dracula, Varney the Vampire, 20,000 Leagues Under the Sea, Journey to the Center of the Earth, Around the World in 80 Days (I count it...wasn't really possible in the late 1800's, even with derigibles). Le Morte D'Arthur, The Once and Future King (1958).
Chronicles of Narnia (last published in 1954, though that would likely appear in the aforementioned "children's" section). L. Frank Baum's Oz series, around 20 books published between 1907 and 1924, also probably in a children's section.
About 20 Robert A. Heinlein novels, ending with Starship Troopers in 1959. (Stranger in a Strange Land came out in 1962, and about 20 more after that).
Frank Herbert's first novel came out in 1957, while fiction, it was neither fantasy nor science fiction, so that doesn't count.
That's all the fantasy and science fiction novels I can think of, that were
published as novels before 1960. Wouldn't fill a library, or a large section of a library. In fact, altogether, they wouldn't fill up a bookshelf in my bedroom, that covers 1/4 of a 20ft long wall. IF somehow I could have all of those, and IF a commercial bookstore before 1960 carried all of those at once.

I'm sure there are a few I've forgotten. But my point remains, there just wasn't ENOUGH fantasy and science fiction books written before LoTR became popular, or around the same time. Tolkien was by far, the most important author of the "fantasy" genre. After Tolkien we have, movies, games, computer games...and, god, more novels that can be counted. 100,000? Certainly 10's of thousands.