Demonstrated how? Could you expand on this part?
There is no evidence to support this assertion. The Bible was written by men, that is fact. You have yet to demostrate this god you assert exists, let alone that it wrote down anything.
So, it records claims of Jesus, either what he said was 100% the truth or nothing he said is true.
As with all mythology, there is a modicum of basis in fact. Such is the way with myths and legends.
No one logically can pick and choose which things Christ said; that they will agree is true. There is no middle ground.
Which is precisely why it is 100% safe to reject all of it as superstitious nonsense.