The Jewish Reformation
When reformers introduce new ideas, they are often met with resistance. Stephen went after the Lost Sheep, the people who had strayed from Judaism. These people were the Samaritans and the Jews who had adopted Greek ways.
What was the reaction of the
There is some evidence of the existence of substantial Samaritan population in first century
There was in fact a problem and reaction to the second part of Stephen’s outreach program. Even the Samaritans objected to the outreach program to the Jews who had adopted Greek ways.
The Reformation split the Roman Church; it also resulted in the first definitive published statement on Catholic identity when the Council of Trent commissioned the Roman Catechism. Leo XIII declared in 1879 that Aquinas gave the definitive statement of Catholic doctrine but this, of course, was long after the Reformation.
In 37 CE, when Stephen was stoned, there was no definitive statement on Jewish identity. However late in the first century there developed a consensus in Judaism inter alia, rejecting the Septuagint. This probably resulted in the preservation of the Hebrew language at least for religious use and a clear distinction between the Jewish and Christian communities. This was a clear rejection of Jews who had adopted Greek ways.
Gospel of Luke