I am discussing this issue on another forum. What you are saying above is what various denominations do in trying to minimalize the bible in order to accommodate and make room for all their contradicting faiths/doctrines they all contain. From your response above, you ARE implying a person can be in doctrinal error and still be saved. If this is true, then the bible is worthless, it serves no purpose when people can believe whatever they want and still be saved. Do you believe that some people from all these thousands of religious groups will be save even though they all contradict each other over doctrine, even though the bible says there is ONE body and ONE faith, Ephesians 4:4-5?
Where are you getting the idea one cannot correctly have and keep all of Christ's doctrine?
2 John 1:9-10 "Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:"
A person better have all of Christ's doctrine correctly else that have not God. And no verse says one cannot have all of Christ's doctrines correctly. "Ye shall know the truth" (John 8:32) means one can know Christ's doctrines.
From the above passage of 2 John 1:9-10 along with Luke 4:4 and Acts 20:27 I see that all of Christ doctrine, every word of God and all of God's counsel are important. So where does the idea come from that not having all Christ's doctrine, not having every word of God, not having all God's counsel is not important or needed to being saved?
Jeremiah 10:23 "O LORD, I know that the way of man is not in himself: it is not in man that walketh to direct his steps."
Man on his own does not know the way, does not know how to direct his steps therefore God gave man an instruction book, the bible, to show man the way and to teach man how to direct his steps. Yet now man says various parts of that book are not really important, not really essential, cannot be known, that man does not really need to know it correctly and yet still be saved? That would be man trying to direct his own steps.