The bad part is (this'll prob be my last post about this, but I keep thinking of stuff) is that the white/light = good and dark/black = evil dichotomy is so deeply ingrained into the fantasy genre that it's hard to get away from.
A book I enjoyed as a kid, Dragon Sword and Wind Child by Noriko Ogiwara, turned the trope on its head: the worshippers of light SEEMED like the good guys, but they really weren't; the worshippers of the dark were. The Hundred Thousand Kingdoms by NK Jemisin does something similar while still stressing how dangerous the dark god is, at least in her mythology. You might note that both of these books are by poc. *shrug*
Anyway. It's a dichotomy I've used in my own writing (unfortunately), but I have attempted to subvert it a little bit by making the bad guy extremely pale and extremely beautiful, bc of course another trope Tolkein introduced was that ugly and twisted = evil, while tall and beautiful = good.
eta: "introduced" was the wrong word to use in that last point; "exploited" would've been better, or maybe "perpetuated"
