Why were there Jewish believers in Paul's mostly Gentile churches?
Paul consistently went first to the Jew in each city, then turned to the Gentiles when the Jews did not respond. His early congregations were predominantly Gentile, yet because of that pattern they contained a smattering of Jewish believers, which archaeology substantiates.
Les explains that Paul was the apostle of the Gentiles, and this was a predominantly Gentile congregation. He notes, however, that there were no doubt Jews in the early congregations because Paul would always go first to the Jew, and then, when he saw that it was not going to reap a harvest among the Jews, he would go to the Gentiles. Les is convinced that in all of Paul's early little congregations there was a smattering of Jewish believers, and he thinks archaeology substantiates that as well.