During the initial marketing of Godzilla: King of the Monsters, King Ghidorah was described as "The Devil with three heads", however it seems like this was more than just a nickname...
In Dante's Inferno Satan is described as being a colossal monstrous being with three faces and bat-like wings. It's stated that as Satan beats his wings, he creates cold winds and storms. He is shown to be trapped within the Ninth Circle of Hell, which is described as being a frozen wasteland. Satan awakens and rises from the pits of hell to terrorize helpless mortals and he attempts to usurp the power of God to take control of the world. Sound familiar...
Interestingly, in the movie, Ghidorah is described as being a "False King", which is what the Devil is occasionally referred to as being. In other biblical stories the Devil is associated with serpents or snakes, occasionally taking the form of one, most notably in the story of Adam and Eve. Needless to say, Ghidorah has a lot of snake-like/serpentine features. It's also intersting to note that, in the movie, it is stated that ancient civilizations were afraid to speak Ghidorah's name and refused to keep records of his existence, it's possible that they were afraid to acknowledge him because they were scared of potentially summoning him and feeling his wrath. In other words, "Speak of the Devil, and he shall appear".
So it seems that Ghidorah has more connection to the Devil than we initially believed...
Interesting, this makes sense in the monsterverse world of myths and pseudoscience
Going by what we have seen in the new trailer and with what little was written on IMDB, they are probably continuing this theme. If we think about it in terms of myths/religion being based on actual historical events, then the kaiju in the monsterverse would/could be represented in religion. Not just western religion, but older Hindu religions as well. There were gods in that religion that had multiple heads too.
Going strictly just by the the Christian religion, then Gidorah (having fallen from the sky) could be ascribed the position of "the morning star". But "Lucifer" being a direct reference to the fallen angel has been questioned by schollars.
If we apply this to the story in this movie franchize, maybe the same could be true? Gidorah could be "The morning star", but the "ruler of hell" could have been another kaiju.
Considering that the kaiju we saw in the trailer was red and sat on a throne and the place around it sort of resembled hell. If this kaiju is from the middle of the earth, and the undertitle is "empire", then the monster could literally have been the source of "the devil".
Well if Ghidorah is Lucifer then (if Toho would allow it) Destoroyah is Satan