I must admit that Bushby's stuff simply sounded too good to be true. I wish it were that simple. Maybe it's even simpler.
A long and short version of Mark is enough to tell me that these are not writings protected by some miraculous force.
The book of John obviously has two endings one of which seems to have been cut and pasted from Mark.
If the Bible in its current state were really "God's" unaltered word that would be enough reason to be an ahteist.