The New Testament was written in Hebrew, not Greek!
I believe that Luke may have written his manuscript in Greek, since he was of Syrian descent and also perhaps the books of Acts, but as far as the other manuscripts of the Apostles, I have no doubt that they were written in Hebrew. The Apostles were Hebrew -- born and raised Hebrew. None of them were from families of wealth, so they were taught the language of their families and most likely were unable to attend a school to learn another language. Even when Yahshua appeared unto Paul on the road to Damascus, Paul admits that Yahshua spoke to him in Hebrew.
Also, Yahshua told his disciples to go and find the lost sheep of the House of Israel and teach them the Good News. He didn't tell his disciples to go to the Gentiles of the nations around them. As a matter of fact, Yahshua told his disciples, when he sent them out to teach the good news, to avoid the cities of Samaria [Gentiles] and go only to the lost sheep of the House of Israel.
I believe that the King James Bible has made many grave errors when they translated the Bible. Of course, this was not exclusively their fault. The Greek manuscripts were firstly translated wrong and I blame Rome and Constantine for these errors.
If you study the history of the early church, you will learn that Rome, and this includes Constantine, and especially Him, for trying to cause a complete separation of the so-called Gentile Christians from anything that resembled Judaism. The early Roman church was even blatant enough to burn many of the early Hebrew manuscripts and kept only those that had been translated into Greek.
The true early believers were persecuted and martyred if they worshiped with any resemblance to the Jewish roots of Christianity. Constantine even had the early name of the True Believers changed. The first and second century true believers were known as THE WAY OF HOLINESS and Constantine forbade this name to be used
No, the original manuscripts were not written in Greek. For goodness sake; James was the first bishop of Jerusalem. Why in the world would James write to the true believers in Jerusalem in Greek? And besides, the Apostles, including Paul, went and taught in the synagogues the message of the Good News of Yahweh's Government and of Yahshua Messiah.
Paul also stated that he was a Hebrew of the Hebrews and a Pharisee of the Pharisee and that he was taught at the feet of Gamaliel.Source: