No it is not conjecture at all but a matter of well known history.
The Maccabee revolt said it all, Judah would rather die than speak anything but Hebrew. They went through the captivity speaking Hebrew, and even changed their captors wisemen’s language to Hebrew through the wisdom of Daniel and their priests, and then beat the Greeks at their own game.
After all that what else would stop them from keeping the language of the creator?
Why believe the foolish fables of unbelievers?
No book of the NT was written originally in any language but Hebrew. The abundant clumsy cultural errors in all of the Greek language epistles shows beyond a shadow of doubt that whoever did the Greek writings had no understanding of the apostles nor their Hebrew culture.
The desire to defeat God’s word makes people wish to believe almost any foolish fable. The clumsy errors of the Greek translations on every Hebrew feast or other cultural matter are there for all to see, to be understood by believers, and deliberately ignored by unbelievers.
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Why don't you ever post proof of the contentions you make? Where are all the manuscript fragments of these "original" NT documents? What proof do you have other than conjecture, supposition and modern-day legend and myth? Do you expect anyone who knows anything about textual criticism to just concede you are right and Christians for the last two thousand years have been missing out on all the fullness of the truth God wants to give?
The "desire to defeat God's word" sounds like it is coming from yours and Michael Rood's side than that of those who believe God can communicate HIS truth no matter what language it is spoken/written in. Your view is the one that seems to be deliberately ignoring that point and depends upon foolish fables.
BTW...do you speak and read fluent Hebrew? If not, who are you to be telling genuine believers they can't understand God's word and are really unbelievers?