Alan you said: have you seen The Name of the Rose? throughout the Dark Ages we relied on monks to transpose and translate ancient manuscripts etc
what if some of the writings went against the doctrine of the day? maybe there was some poetic license/creative editing
this is the basis of another movie Stigmata about the lost gospels which challenged the power of the Church, fictional yet thought provoking, take a look some time Ridge
My comment:
Unfortunately they could not get away with it. Copies of manuscripts spread far and wide and from many different centuries so it is easy to pick up an attempt at fraud. Besides they had more respect for books by God back then.