What part of Messiah saying that his doctrine is not his but the doctrine of the One that sent him? What part of there was no other instruction book than Torah to read and teach from don't you understand? What part of YHVH saying He never changes is so hard to understand? Are traditions of man so important that they now supersede the Word of YHVH?
Now do read the Bible -- Galatians 5:2-3 2Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
3For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
4Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
and 1 Cor 7:18 18Is any man called being circumcised? let him not become uncircumcised. Is any called in uncircumcision? let him not be circumcised.
Please do read the Bible and realise that your statement Paul were Jewish who followed Messiah in the keeping and teaching of Torah is wrong -- he on the matter of circumcision taught against the Torah.
So do you not read or teach from any of the New Testament books? Are Galatians and Colossians not worthwhile to you?