Over zealous monks would have to find over 6 000 manuscripts, or portions of manuscripts, in the Greek, change all of them, not show their inkwork, not get caught, and get them back were they stole them from.
They would have to learn how to lie, not only in Greek, but also in Syriac, Coptic, and Latin. Find all the Syriac, Coptic, and Latin translations of the Greek manuscripts, change those to match the lies they told in Greek, not show their inkwork, not get caught, and get all those back from were they stole them from.
Now find all the writings of the early church fathers, lie, but remember the lies that they told in Syriac, Coptic, Latin, and Greek; steal those, not show their inkwork, not get caught, and get all those back from were they stole them from.
Oh, and by the way they'll have to live three hundred years to get this done.