Yahweh was originally a weather god, not unlike Zeus, well before being interwoven with El during proto-Judaism [1]. Any "Greek period" of the eventual Jewish f

Yahweh was originally a weather god, not unlike Zeus, well before being interwoven with El during proto-Judaism [1]. Any "Greek period" of the eventual Jewish faith, to which you refer, ended certainly by their complete adoption of monotheism. Judaism came "pre-Greeked". That particular Council affirmed that Christianity's God is triune by expressly rejecting Arianism. God sending God to do things God could already do is heavily a consequence of the trinity [2], hence why Nicaea was a big deal theologically. Whether a monotheistic God is unary, binary, trinary, etc has implications that seem sufficiently fundamental that no major religion will abandon its chosen view. [1] https://en.wikipedia.org/wiki/Yahweh https://en.wikipedia.org/wiki/Yahweh [2] https://en.wikipedia.org/wiki/Trinity https://en.wikipedia.org/wiki/Trinity