How did the writings of the NT come to be?

[Undeceived]

They could move from one side of it to the other through the Mediterranean sea. Yes the bounderies were huge. Every place you mentioned is contained within the roman empire at the time of Christ.

I'll sum up your argument as this "you can't verify the source of where the 27 NT books come from because they're scatted from one end of the roman empire to the other, and they were supposed to come from Jerusalem".

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Well that argument can't even support itself on the evidence you gave us. Read the book of Acts, it talks about the spread of the early Church, and Matt 28:19 where Jesus tells the disciples to spread the Church: "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit".

BTW, it makes no difference WHERE most of them were written anyway. And it also makes no difference that Paul used scribes to write his epistles rather than writing them himself.

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My point is not that they couldn't move from one place to the other....
The point was that whatever story was propagated along those vast reaches couldn't be verified by the local population. So those "leading churches" had unverified accounts which are today claimed to be "true, because the eye witnesses wouldn't allow those accounts to be false".
Curiously, Jerusalem is not counted as one of the "leading churches"... Maybe they were too "orthodox"...

Every one of Paul's letters was sent to a church and then circulated amongst the churches. They knew how Paul wrote--they had met him personally. He and other Apostles like Peter or helpers like Timothy, Erastus, Barnabas and Philip visited the churches often. They could verify a writing simply by sending a letter to the author. If the author left no address, it would not be accepted. None of the circulated works were anonymous. They all had introductions communicating faith in the writing the church was passing along--a letter separate from the main text. Trusted authors recommended other authors. This is how the Biblical canon was put together: three hundred-plus bishops from the three hundred church areas around the empire came together and voiced which books their area was already using. Largely, they agreed.