What was the reaction of the Jerusalem church to the news that Gentiles were being saved?

Les explains that in chapter 15, after Paul and Barnabas had completed missionary endeavors throughout Asia Minor, they returned to Antioch. Gentiles were coming into that congregation, and when the news reached Jerusalem, the Jerusalem people—Peter, James, John, and the rest—just could not comprehend that God was doing this with Gentiles. This occasion became the council of Jerusalem, which Les dates to A.D. 51, some twenty years after Pentecost. Even at that late date, the Jewish people of Jerusalem were still not ready to accept Gentiles being saved by Paul's gospel aside from keeping the law and circumcision. Les notes that he has gone through this material several times and does not feel right repeating it again, but he still needs to cover the parts of the chapter not yet covered, beginning down at verse 13.