What were the major issues of controversy that led to the appearance of Paul and Barnabas before the Council in Jerusalem?

The major issues of controversy that led to the appearance of Paul and Barnabas before the Council in Jerusalem were circumcision and the Law of Moses. Some Jewish Christians believed that Gentile Christians should be circumcised and follow the Law of Moses, while Paul and Barnabas believed that faith in Jesus Christ was enough for salvation and that Gentiles did not need to follow the Jewish customs of circumcision and the Law of Moses. The Council in Jerusalem was called to address this controversy and to come to a decision on whether Gentile Christians needed to be circumcised and follow the Law of Moses. Ultimately, the Council agreed with Paul and Barnabas and decided that Gentile Christians did not need to follow the Law of Moses or be circumcised in order to be saved.