[NYer]

How would Luke or his friend have the understanding of the Hebrew language which "only a knowledgeable Jew would have understood?"

St. Luke had a great knowledge of the Septuagint and of things Jewish, which he acquired either as a Jewish proselyte (St. Jerome) or after he became a Christian, through his close intercourse with the Apostles and disciples.

Gospel of St. Luke

[FormerLib]

In context, this can only mean that Luke had acquired knowledge of the Jewish faith. Can that be such an amazing thing? I believe the Bible tells us of such Gentiles in several places.