Paul was a follower of the unitarian Jesus. Both Jesus and Paul cited the Shema of Deut. 6:4, 4:35, 39. There was never any doubt about this, until the church fathers tried to define God differently in terms of Greek philosophy [i.e., Nicene-Chalcedonian councils].
Jesus was not a philosopher, and Paul warned against it.
In 1Cor. 8:4-6 Paul reaffirmed the Shema of Deut 6:4 and of Mk 12:29. Paul put alongside the one God, the Messiah Jesus, now in heaven This is exactly what Jesus had done in citing Ps. 110:1 (the NT’s favorite proof-text). The second lord is the Messiah, human lord.
Paul called Jesus the Messiah and our Lord, over 100 times. Paul called God the Father of the one Messiah.
Luke identified Jesus with a birth certificate. He is “the Messiah Lord,” born at Bethlehem.
It is extreme and improbable that Paul altered the Shema in one verse in 1Cor. 8.4-6!
Paul summarizes his theology with this in I TIm. 2:5 “There is one God and one Mediator who is the Man Messiah.”
Jesus said the same thing in John. “Believe in GOD, believe also in me.”
When called “good” by a questioner, Jesus immediately warned him to be careful and to call no one good except the One God.
None of this is complex. Jesus still to this day speaks of God as “my God.”
it was only hostile and blinded, ie misunderstanding Jews (some of them) who accused Jesus of being God, a charge which he refuted, citing the Bible.
Jesus was a unitary monotheistic Jew, and this is perfectly simple and obvious in Mk 12:29.
Jesus defined the Father, as every Jew would, as “the only one who is true God” (John 17:3).
The only way the philosophically-minded Augustine could deal with this unitarian statement was by altering the whole structure of Jesus’ words in John 17:3!
Jesus is stricitly unitarian. Just as Jude 4 defines God as “the only one who is our Master.”
Jesus is our human rabbi.
Christians are pledged to following the teachings of their rabbi and master, Jesus. By his words we will be judged (John 12:44ff. Heb 5:9; I Tim. 6:3; II John 7-9; Acts 17:31).
The word GOD in the NT references the Father 1300 times and the word GOD never means a Trinity in the Bible.