'Jews and Greeks' in the Bible

At Iconium in the same way, they went to the Jewish synagogue and spoke with such power that a great number of both Jews and Greeks believed.

Every Sabbath he would preach in the synagogue, and try to convince both Jews and Greeks.

What does this mean? Are we Jews at a disadvantage? Not at all. We have already charged Jews and Greeks all alike with being under the control of sin.