I didn’t mean to say that Tolkien was a fan of pagan mythology, just mythology. The Silmarillion was monotheistic, with Eru representing God (God doesn’t really have a name). The Valar were the angels, and as stated were sometimes mistaken by men as gods. Morgoth was, who else? As much as Tolkien hated allegory, there is no mistaking this. Early on, Morgoth corrupted a number of the valar and so you have it. War over good and evil on Earth and so forth. Only the strains of good and evil were in more pure form than you find in other fantasies like Game of Thrones.
Yes. The books by George R. R. Martin are pagan. I started one, but did not finish it.
They call him the American Tolkien, but I think that is a superficial accessment.
Chesterton, who was not an Inkling, but influenced Lewis directly and was also admired by Tolkien, referred to Christianity as true mythology.