Historically, the Council of Nicea was called to decide on what the Church should adopt as official doctrine on the nature of Jesus because there were differing views amongst the 'Hellenistic' Christians
The Council of Nicea was convened to decide the date of Easter.
At Nicea, the main debate was between Arius who argued that God was one, and Trinitarian Bishops who believed in the Trinity.
Arius believed Jesus was God.
From my perspective, the earliest 'Jewish Christians' who followed Judaic law and were circumcised etc and believed in one true God are the closest to Jesus' actual teachings rather that what is termed 'Pauline Christianity'.
You do realize that Paul followed Jewish Law, right?
(no, of course you didn't, but you'll probably claim you did)