How was this accomplished? To whom was the information conveyed?
God picked men and inspired them to write the scriptures...
God said he would preserve his words forever...That has just as much truth as when Jesus said, 'I and the Father are one', or, 'Come unto me and I'll give you rest'...
The only bible that all Christians agree that contains only scripture comes from the area where people were first called Christians and is the result of the Received Texts, the Majority Texts, the Masoretic texts...
The Body agrees that that book does not contain more material than God gave us...And either he told the truth and preserved his words, or he didn't...I believe God told the truth...