Answer:
(not my ans)
Christianity began as a Second Temple Judaic sect in the 1st century in the Roman province of Judea, from where it spread throughout and beyond the Roman Empire.
Explanation:
Catholic Encyclopedia: Proselyte: "The English term "proselyte" occurs only in the New Testament where it signifies a convert to the Jewish religion (Matthew 23:15; Acts 2:11; 6:5; etc.), though the same Greek word is commonly used in the Septuagint to designate a foreigner living in Judea. The term seems to have passed from an original local and chiefly political sense, in which it was used as early as 300 BC, to a technical and religious meaning in the Judaism of the New Testament epoch."
Ecclesiastical historian Henry Hart Milman writes that in much of the first three centuries, even in the Latin-dominated western empire: "the Church of Rome, and most, if not all the Churches of the West, were, if we may so speak, Greek religious colonies [see Greek colonies for the background]. Their language was Greek, their organization Greek, their writers Greek, their scriptures Greek; and many vestiges and traditions show that their ritual, their Liturgy, was Greek."[24]
