Fairy tales and Chinese whispers: is the New Testament reliable?

The High Priestly Prayer

When Jesus had spoken these words, he lifted up his eyes to heaven, and said, “Father, the hour has come; glorify your Son that the Son may glorify you, ² since you have given him authority over all flesh, to give eternal life to all whom you have given him. ³ And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent. ⁴ I glorified you on earth, having accomplished the work that you gave me to do. ⁵ And now, Father, glorify me in your own presence with the glory that I had with you before the world existed.

⁶ “I have manifested your name to the people whom you gave me out of the world. Yours they were, and you gave them to me, and they have kept your word. ⁷ Now they know that everything that you have given me is from you. ⁸ For I have given them the words that you gave me, and they have received them and have come to know in truth that I came from you; and they have believed that you sent me.