God is not a man, that he should lie, nor a son of a man
Jesus answered, “I have spoken openly to the world; I have always taught in synagogues and in the temple, where all the Jews come together. I have said nothing in secret.
He strictly ordered them that no one should know this.
Mark’s Jesus seems to ALWAYS be telling his disciples and those he heals to keep his deeds secret. John’s Jesus swears under oath in front of the Jewish Sanhedrin (high court) that he has said nothing in secret.
This is a blatant lie.
To Jews, God cannot lie, therefore this is absolute proof to them (and it should be to Christians) that Jesus was not God.