[MHT]

It appears that in the earliest days, according to the modern Jews for Jesus, being Jewish was a prequisite of the early church. After all, the disciples really didn't like the idea of gentiles chasing him around thinking that he was the greatest thing before sliced bread. They wanted Jews to follow him. Unfortunately, there were not enough men like Joseph of Aramethia in leadership positions.

[RobbyS]

Remember that there were Greek-speaking Jews like Stephen, so that the cultural gap between Greeks and Jews was both wide and narrow. That Our Lord is known by his Greek name suggests
that bridges have been thrown across it early on. I have read that there are many hints that Matthew knew both the Hebrew and the Greek versions of the Bible, that he preached to speakers of both Aramaic and Greek.