Well, I suppose my answer would have to be a flat out yes to the first question, nor would I necessarily trust any portion of it.
Lol, I just read your profile. I guess I could have answered that first question without asking you. Sorry about that.
But the problem here is that everything within the history of Christianity seems to agree with me. You have councils that occur in 400, 500 AD that discuss the implications of doctrines and implementing new dogmatic traditions. you have multiple instances where scholars and church fathers have disagreed on interpretations to the point of splitting off and forming new churches.
This is bound to happen. Even in the early church days mentioned in the Bible people were creating their own special doctrines.
1 John 4:1
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
2 Peter 2:1
But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction. 2 And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of.
Mark 7
6 He answered and said unto them, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me.
7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.
8 For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do.
The pharisees, much like many people today, taught doctrines that weren't backed up by the word. They were partially backed by it, but they added and twisted in any way they wished. This is free will.
I mean, i suppose we are kinda talking about two different things here. Youre discussing divine protection of the scripture, but that doesnt necessarily mean divine protection of the interpretation of people who were writing this down when they were in the presence of the holy spirit. Whether it be god/angels dictating or inspiring them to write it, theyre still men, fallible, with biases, and misinterpretations and misunderstandings.
I believe that when it comes to scripture, if the Holy Spirit were going to compel the disciples to write things down, that He would oversee the accuracy of what was written down. Otherwise there isn't really a point to inspiring them to write it down. Even if you don't believe in God, you can see that if God is real He would want His word to go out unadulterated. At least at the start out. After that it is up to humans maybe and maybe He has kept His hand on it this whole time.