Interesting, but self-referential.
Proving the existence of a deity, or the deity of a man/god, based on the scriptures of the religion which believes both to be true is a tautology.
You can find the same proofs in Hinduism, Islam, or any other scripturally-based religion.
Are they all valid? No. Are any of them valid. Well, the one you believe is valid is valid for you.