Yes. Luke was a greek doctor. I believe he was the only Gentile author.
But most of the New Testament (and Obadiah, Nahum, Jonah in the Old Testament) is written for the benefit of a Jew/Gentile audience even though they are written by Jewish authors.
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The Gentile nation.
That would be correct. There are many words that are not in the Bible. (ie: Catholic, Lutheran; not even the word cross, or Christmas, or Easter, or Halloween) Neither is the word 'Bible', in the Bible.
The Gospel of Luke is a biographical account of Jesus that was specifically attuned to the Greek mindset of the first-century world. In fact, Luke (also the author of Acts of the Apostles) is the only Gentile among all the Bible writers.
About 40 writers were used to record the Bible. (2 Peter 1:20, 21)
Most say there are 40 writers of the various works in the Bible.