One can piece together the original using deductive analysis in comparing all extant early manuscripts.
The fact of the matter is that I accept that God has preserved his word through the ages. It is the most well documented book in the history of the earth.
I agree that the Bible is probably the most reliable text in history, thousands of copies as opposed to hundreds for other ancient texts. However, “piecing together” requires a “priecer,” and one must know first which of the books are to be included in the collection.