>> “What evidence do you have that the Gospel authors did not have familiarity in Greek as well as Hebrew?” <<
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Get real! - They were poor working class men.
Further, the Hebrew language is YHVH’s language, given specifically for conveying his word to all.
It is not likely that anything in the NT was first written in any other language, except for certain letters by Paul, that may have been written in the native language of the intended recepients. Paul was the only apostle commissioned to the gentile world.
“Get real! - They were poor working class men.”
Some were, some weren’t. Matthew was a tax collector, that’s not ‘working class’. Luke was a physician, and he wasn’t ‘working class’ either.
Sounds like you’ve picked up the Gospel according to Marx, not scripture.
“Further, the Hebrew language is YHVH’s language, given specifically for conveying his word to all.”
Did Adam speak Hebrew?
“It is not likely that anything in the NT was first written in any other language”
And what evidence besides speculation do you possess to confirm this statement to be true? Do you have any manuscript evidence to confirm this? No. Is it true that they were probably more familiar in Hebrew? Sure. But I don’t see the evidence, and the textual evidence contradicts you. It is quite possible that Christ’s teachings were passed around orally, and then when recorded in Scripture some 20-30 years after his death, that they were written in Greek.
It’s also possible that the Apostles in the bible, had fewer skills than their counterparts 20-30 years later, about whom the bible does not talk about. People do learn things as they get older, especially when they leave their former life behind and take up another.
“Paul was the only apostle commissioned to the gentile world.”
Was he the first? Sure. Was he the only one? No. He was accompanied on his missions. There is considerabl textual evidence supporting a Greek origin of every NT book. There is zero supporting a Hebrew origin in terms of actual documents.