Just want to add that there is no one thing that is Greek Paganism or Christianity. Any belief system of sufficient age is incredibly diverse and I'd be wary of people online making big generalizing statements about them.
There's actually an epic called the Dionysiaca, about Dionysius, that's longer than the Iliad and Odyssey combined. I think there's still only one English translation of it but it's pretty interesting. It has a story of Dionysius being reborn that might be related to this.
I’ve been a student of early christianity (first three centuries) for just over a year. The wiki entry on Nonnus is scant. Can you please recommend quality literature to learn more about the Metabole? It’s not clear to me the purpose of the text.
That's not really my area, but I can offer a few. The big one would be the new Brill's Companion to Nonnus (2016) and anything by Domenico Accorinti, who seems to be the person most often working on Nonnus now.
- Accorinti, D. 2020. "Did Nonnus Really Want to Write a 'Gospel Epic?' The Amabiguous Genre of the _Paraphrase of the Gospel According to John._ In Hadjittofi, F. and Lefteratou, A. eds. _The Genres of Late Antique Christian Poetry_. Berlin: De Gruyter. 225–48.
- Accorinti, D. 2016. _Brill's Companion to Nonnus of Panopolis._ Leiden: Brill.
- Hadjittofi F. 2020. "The Poet and the Evangelist in Nonnus' Paraphrase of the Gospel According to John." Cambridge Classical Journal 66: 70–95.
The First Council of Nicaea spoke for some of the Church at the time, and became the prevailing position of most Christian churches, but it's not a monopoly. Most obviously, non-trinitarian Christian churches have popped up sporadically since then, and several exist today.
today more than 2 billion people say the Nicene Creed or Apostles' Creed or the Orthodox Symbol of Faith regularly. Non-trinitarians are found how often? From an analytic point of view what you say is valid. Regarding the sociology of Christianity, the overwhelming majority of practicing Christians use that construct.
There's actually an epic called the Dionysiaca, about Dionysius, that's longer than the Iliad and Odyssey combined. I think there's still only one English translation of it but it's pretty interesting. It has a story of Dionysius being reborn that might be related to this.