Paul specifically relies on the Galatians to recognize Jesus as God in Gal 3:19-20. It is the promise from the Father to Jesus that has only one party and thus is from God to God.It's not the late use of the term but it's the length of time between the OT, the life of Christ, and the life of the apostles that it took to reach this "right" theological descriptor and there are plenty of doctrinal issues.
I doubt any Jew recognized the "threeness" of God.
Matthew 28:19-20 reflects the threeness.
The threeness was acknowledged in the first century via the promotion of Mat 28:19-20 but also expressing the threeness by Clement of Rome: "Do we not have one God, and one Christ, and one gracious Spirit that has been poured out upon us, and one calling in Christ?" (1 Clement 46:6)
The threeness is not pagan religion nor is it a late development.
John 17:3-5 shows Jesus had the glory before he was incarnate. Matt 26:64-65 was quoting Dan 7:13-14 showing the divinity of Christ. It is basic blindness to such details that some fail to recognize who Jesus is.I don't see where Jesus ever taught he was God nor claimed to be God.
That is also what unitarians do. They deny Jesus's words in favor of 6 verses by one writer saying they baptized in the name of Jesus. However, that distinction can simply be to differentiate from the baptism of John the Baptist.Yes, the three are mentioned together in Matt. 28:19,20 . . does that indicate a Trinity doctrine? I don't believe it does but just because I do not believe in the Trinity doesn't mean nor give me the right to get rid of the verse. I have to look at the scope of scripture and from the scope of scripture baptism was done in the name of Jesus.
I'm sorry you lost your trinitarianity. You must remember that Jesus is not said to be a separate god. So his divinity does not violate him pointing out the Father as the true God.The outright denial of something that is not in scripture raises concerns?
Jesus said his Father was the only true God - I believe him. Jesus said the first and great commandment was the Shema (Deut. 6:4, Mark 12:29) I believe him.
I was raised Baptist so I used to be a Trinitarian.