Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God:( I Cor 10:32)
Paul didn’t confuse Jews and Christians
The true Jew is one inwardly, not DNA.
Ephesians 2:11-22 says the Gentiles at one time we’re strangers to the commonwealth of Israel, but now in Christ are fellow citizens with Jewish believers.
Israel is made up of those in Christ, not Jewish DNA.