Absolutely false. Furthermore when Paul speaks about Jews and Israelites in Romans he speaking about the Sons of Jacob. And when he speaks of anyone else Paul uses the term gentiles. Unfailingly........in all of his writings.
THREE TIMES Paul makes the same declaration (Rom 1:16, Rom 2:9, Rom 2:10):
"Jew first and also of the gentile"
This is meant to reinforce the clear distinction BETWEEN the two groups.
This obviously intentional precedent is followed throughout scripture by Jesus (Matt 15:26 etc) and the apostles preaching campaign.
Oh and by the way when Paul speaks about the "Israel of God" in Gal 6:16, Paul yet again makes a distinction between the two groups. The "Israel of God" are all believing sons of Jacob.....Jewish converts who believe that Jesus is their Messiah.
Easily refuted. Just read the first verses of Romans. "To all that be in Rome, beloved of God, called to be saints". No mention of "Only the believing sons of Jacob", or whatever other geneological-cult-based beliefs you had in mind.
Romans 1:1-7
Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
(Which he had promised afore by his prophets in the holy scriptures,)3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;
And declared to be the Son of God with power, according to the spirit of holiness, by the resurrection from the dead:
By whom we have received grace and apostleship, for obedience to the faith among all nations, for his name:
Among whom are ye also the called of Jesus Christ:
To all that be in Rome, beloved of God, called to be saints: Grace to you and peace from God our Father, and the Lord Jesus Christ.
Also note Jesus' words to those Pharisees claiming Abraham as their father.
John 8:39-44
They answered and said unto him,
Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.
But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.
Ye do the deeds of your father. Then said they to him, We be not born of fornication; we have one Father, even God.
Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me.
Why do ye not understand my speech? even because ye cannot hear my word.
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.