What makes you think that Christians understand Jewish scriptures better than the Jews do? Why should I believe you that they are wrong and you are right? Why not Mormons or Muslims? Because you say so?
How do you even know what Caiphas knew? From what an anonymous writer with an agenda had to say about him 2000 years ago?
The short answer would be Jesus the Christ.
And you, of course, have no agenda? Who is being naive here?
Beyond that I must say: Sorry, kosta50, you are stuck in your own nightmare of doubt. I have no desire to join you there.