On the day of Pentecost all the believers were meeting together in one place. . . . . and everyone present was filled with the Holy Spirit and began speaking in other languages, as the Holy Spirit gave them this ability. . . . .when they heard the loud noise, everyone came running, and they were bewildered to hear their own languages being spoken by the believers. They were completely amazed. “How can this be?” they exclaimed. “These people are all from Galilee, and yet we hear them speaking in our own native languages! Here we are—Parthians, Medes, Elamites, people from Mesopotamia, Judea, Cappadocia, Pontus, the province of Asia, Phrygia, Pamphylia, Egypt, and the areas of Libya around Cyrene, visitors from Rome (both Jews and converts to Judaism), Cretans, and Arabs.At the birth of the Church, gifts were given to the believers to enable them to speak to people from all over the world. The passage actually doesn't say that every person around was either ethnically Jewish or a convert, only the visitors from Rome are described thusly. Jerusalem was evidently a cosmopolitan place, with people from all over the known world there, and all of them heard these fishermen from Galilee speaking in their own language. Even people who would normally be avoided by "good Jews" were included in this. All of the prophets' words about the whole world coming to Jerusalem and hearing the message of God there came true that day, and before Christians were called that, before they left the synagogue, the message about Jesus was being told to people from all over the world regardless of origin or ethnicity.