where does he say that jews dont know the true god? it would be odd for that to be true since at the time they were the only people(besides Samaritans maybe) that worshiped God instead of pagan gods.
John 6 37 all that the Father doth give to me will come unto me; and him who is coming unto me, I may in no wise cast without,
John 5 37 'And the Father who sent me Himself hath testified concerning me; ye have neither heard His voice at any time, nor His appearance have ye seen; 38 and His word ye have not remaining in you, because whom He sent, him ye do not believe.
39 'Ye search the Writings, because ye think in them to have life age-during, and these are they that are testifying concerning me; 40 and ye do not will to come unto me, that ye may have life; 41 glory from man I do not receive, 42 but I have known you, that the love of God ye have not in yourselves. 43 'I have come in the name of my Father, and ye do not receive me; if another may come in his own name, him ye will receive; 44 how are ye able -- ye -- to believe, glory from one another receiving, and the glory that is from God alone ye seek not? 45
'Do not think that I will accuse you unto the Father; there is who is accusing you, Moses -- in whom ye have hoped; 46 for if ye were believing Moses, ye would have been believing me, for he wrote concerning me; 47 but if his writings ye believe not, how shall ye believe my sayings?'
John 8 19 They said, therefore, to him, 'Where is thy father?' Jesus answered, 'Ye have neither known me nor my Father: if me ye had known, my Father also ye had known.'
John 8 42 Jesus then said to them, 'If God were your father, ye were loving me, for I came forth from God, and am come; for neither have I come of myself, but He sent me;
John 9 29 we have known that God hath spoken to Moses, but this one -- we have not known whence he is.'
Mark 7 13 setting aside the word of God for your tradition that ye delivered; and many such like things ye do.'
What is the Oral Torah?
As mentioned earlier, there are two "Torahs": the Written and the Oral. In Jewish tradition, both were given to Moses at Mt. Sinai and during the forty years in the desert, and taught to the whole nation. [In fact, when Judaism says "G-d gave the Torah to Moses at Sinai" it is talking only about the Oral -- otherwise, Moses should have known about the Golden Calf, and as for Korach's Rebellion, Moses should have reacted "well, we've been expecting you..."]
Both have been with us, according to Jewish sources, for all of the past 3300 years. And without both, it is impossible to fully understand traditional Jewish teaching or thought. The Written Torah, mentiones each of the Commandments, or Mitzvos, only in passing or by allusion. The Oral Law fills in the gaps.
What is the oral Torah? - Torah.org
Galatians 1 6 I wonder that ye are so quickly removed from Him who did call you in the grace of Christ to another good news; 7 that is not another, except there be certain who are troubling you, and wishing to pervert the good news of the Christ; 8 but even if we or a messenger out of heaven may proclaim good news to you different from what we did proclaim to you -- anathema let him be! 9 as we have said before, and now say again, If any one to you may proclaim good news different from what ye did receive -- anathema let him be!
10 for now men do I persuade, or God? or do I seek to please men? for if yet men I did please -- Christ's servant I should not be.
11 And I make known to you, brethren, the good news that were proclaimed by me, that it is not according to man, 12 for neither did I from man receive it, nor was I taught it, but through a revelation of Jesus Christ,
13 for ye did hear of my behaviour once in Judaism, that exceedingly I was persecuting the assembly of God, and wasting it, 14 and I was advancing in Judaism above many equals in age in mine own race, being more abundantly zealous of my fathers' deliverances, 15 and when God was well pleased -- having separated me from the womb of my mother, and having called me through His grace -- 16 to reveal His Son in me, that I might proclaim him good news among the nations, immediately I conferred not with flesh and blood, 17 nor did I go up to Jerusalem unto those who were apostles before me, but I went away to Arabia, and again returned to Damascus,