When you look at Jesus's criticisms of the phariseess and the sribes, he points to hypocrisy as a big issue. This is very much like the prophets, very much like Amos, Obadiah etc. His teachings are much like the minor prophets.
The problem is that Jesus did not write one book by his own hand. So all we have is other men writing about what he said. The problem is that a lot of the NT contradicts, mistranslates and invents messianic passages from the OT. Whos fault is that...Jesus's? Or the men who wrote the NT? Since Jesus didnt write a word of it...I blame the authors of the NT. What did Jesus really believe of himself? We will never know. He wrote nothing.
All I know is that the NT is riddled with error both in eisegesis and theology.
C.S. Lewis’ argument does have its place. But it is not the only Christian apologetic available to Christians. I don’t believe he was even trying to use it against the Jewish understanding of Jesus but against secularists who tried to make the claim that Jesus was only a good man.