I have faith that God determined His Canon and revealed it to His Church. Obviously, not all followers have apprehended God's revelation equally. We each have our beliefs. As to the NT Deuts, apparently they were less controversial. I don't see the problems in the NT that the OT Deuts give rise to. Even though I understand that Orthodoxy did not accept Revelation until much later, I would offer the evidence that we agree on the NT. Given the split at the Reformation, it seems those books must have been pretty solid in God's Church since none were changed or removed. Further evidence is that Luther TRIED, but the laity of the church stopped him. That is the Spirit in action.
I'll agree. That was very fortunate for our Protestant brothers...
Regards