If you have ever seen Aramaic writing you can understand why those educated in classical Greek chose to write in classical Greek instead of Aramaic. Also Christianity has spread beyond Judah and Galilee into areas where classical Greek was spoken. The Christian manuscripts were not written with the thought that they would be 'scripture' in the same context as the Old Testament Scriptures, but rather were intended for reading and circulation and teaching in the congregations forming across the eastern Roman Empire. So they were written in the language that was most universally useful.
Apparently you haven't studied it as thoroughly as you think. And I would be careful about accusing people you don't know about what they have and have not studied. I would post my evidence but I doubt you would accept it and it would be really tedious to post the entire bibliography as well as the lesson notes from seminary courses.
You're spinning and no nothing of the time period other than what's in the bible. The Jews at that time were so Hellenized only a small minority could speak or read Hebrew or Aramaic. The Pharisees and Sadducees considered the language sacred, it's what God spoke. Sure Christianity spread and got translated into different languages but we're talking about the beginning.
So you are reading translations and interpretations of what the Jesus figure said. Seems implausible considering how important the message was. That was my point.
A seminary education? That explains your ignorance.