There were no gentile children of God before the conversion of Cornelius and his household. This is when God by his grace made the sacrifice of Jesus Christ efficacious to the world and sent his Jewish preachers out with the gospel of God, which is the theme of the 13 letters of the apostle Paul to the gentiles and is summarized in this statement here.Please clarify. Are you saying there were no children of God among the Gentiles prior to AD 40?
You write a lot like @John of Japan. You're not him are you?
Rom 15:24 The grace of our Lord Jesus Christ be with you all. Amen.
25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
26 But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:
27 To God only wise, be glory through Jesus Christ for ever.
Paul's "my gospel" is the gospel of God.
Rom 1:1 Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
How do you think a sinner becomes a son of God? It is not just a title, you know.
I am not John of Japan.