I have seen estimates that during century 4, which is when the Nicenae Creed was formulated and the canon of Scripture established, that the majority of Christians were followers of Arius, who IIRC beleived that Jesus was not a pre-existent part of the Godhead, but a created being.

Constantine called the councils to sort out this mess.

At any rate, the “of one essence” clause in the Creed is there specifically to anathematize Arianism.

Data Driven Econophile. Muslim, USA born. Been “woke” 2x: 1st, when I realized the world isn’t fair; 2nd, when I realized the “woke” people are full of shit.