Is the Bible what academic palaeographers say it is?
Or is the Bible what believers have historically read as the Word in their worship?
Mark 16:9-20 may fail by some of the standards of the academy - but this pericope passes with flying colors by the standards of the Church.
And it is the importance of scripture in the Church that generated the interest in creating the academic endeavor of textual analysis in the first place - it seems as if the discipline has forgotten its roots.
The problem we have is that we have a First Hand observer, who dealt directly with the Son of God; and wrote his books - then we have 2,000 years in which scholars have had time to “pad” the Word of God with the Word of Man.
Me, I’m a big fan of the Dead Sea Scrolls - because they have slipped through time (written between 150 BC to 70 AD) largely untouched by the corruptions of man. It is in Man’s nature to exaggerate - even truths from God. The closest thing we can get to the origional message, is the origional manuscript - and barring that, perhaps a manuscript that hasn’t been touched for nearly 2,000 years.