Under the leadership of the apostles Peter and Paul, who both died around the year 64 CE, the early Christian community grew from Jerusalem to Rome, from a Palestinian Jewish sect to a more universal group that included Gentile non-Jewish people, all around the Mediterranean area.  The travels of Paul as found in the Acts of the Apostles and his letters give a glimpse into what was happening back then.  The followers of Jesus Christ began to differentiate themselves from the Rabbinic Judaism that was developing at the same time.