The council of Nicaea did not have anything to do with the reformation of the church cannon, nor the editing of the biblical text. However the
Council of Trent did.
A full list of the subjects covered in the catholic church can be found
here.
Including...
The Fourth Session of The Council of Trent
Moreover, the same sacred and holy Synod,--considering that no small utility may accrue to the Church of God, if it be made known which
out of
all the Latin editions, now in circulation, of the sacred books, is to be held as
authentic,--ordains and declares, that the
said old and vulgate edition, which, by the
lengthened usage of so many years, has been approved of in the Church, be, in public lectures, disputations, sermons and expositions, held as
authentic; and that no one is to dare, or presume to reject it under any pretext whatever.
Emphasis: Mine
Hyper-linkage: Mine
Before this council, various versions and editions of the bible were commonly used. Some bibles had books within them that others did not. The oldest
complete version of the bible known to exist is the
codex sinaiticus which is heavily corrected (this
"correction" is just another word for edited)
So between the 3rd or 4th century when bibles were hand crafted to the 16th century, no official cannon was adopted by the church. The Council of
Trent was in fact the point in time that the biblical cannon as it is known today was selected. This edition was in line with what the church sought
to teach.
The amount of editing done to the bible is apparent in the versions of the bible today. In The English language there are over a
hundred versions of the bible, showing that the bible itself has been heavily edited through the
ages.
