The Torah was not written just for the "Jews".  Moses was not a Jew and neither was Abraham.  Abraham came from a gentile stock.

If Jesus is not the promised messiah who came and will come again, the temple services would still be going on and they would not have been destroyed after Jesus' death and resurrection. 

The practice of Judaism requires a temple, animal sacrifices and a a priest, if not, Judaism in reality cannot be practiced in the absence of these elements.  This is the consequence of not accepting that a messiah has already come whose name is Jesus who fulfilled all the prophecies of the messiah.

The third temple can never be rebuilt and neither will another messiah come.  Read here why: https://en.wikipedia.org/wiki/Third_Temple

Who was Abraham and who are "gentiles"? https://www.gotquestions.org/Abraham-Jew-Gentile.html  (Another article)

The whole point of the Torah and the OT and the temple, and sacrifices, and the priesthood was to point to a superhuman (beyond human) savior and not just another human being who would come to save all and who will be born of a virgin as God in the flesh, live an exemplary life, be crucified as the ultimate sacrifice and be resurrected and ascend to heaven and who promised to come back the second time to complete the mission of worldwide salvation.  These events are historically undeniable.  If these teachings are rejected, you might as well reject Judaism which really cannot be practiced now without a temple or sacrifices or a priesthood by rejecting the messiah who already came and fulfilled all the messianic prophecies and proved as such.

References from the Torah part of the Bible and Josephus, a Jewish historian:
“Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel” (Isaiah 7:14).

“But you, Bethlehem Ephrathah, though you are small among the clans of Judah, out of you will come for me one who will be ruler over Israel, whose origins are from of old, from ancient times.” (Micah 5:2).

Isaiah 53
3 He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not.
4 Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted.
5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.

Jospehus’ Description of Jesus
3. (63) Now, there was about this time Jesus, a wise man, if it be lawful to call him a man, for he was a doer of wonderful works-a teacher of such men as receive the truth with pleasure. He drew over to him both many of the Jews, and many of the Gentiles. He was [the] Christ; (64) and when Pilate, at the suggestion of the principal men amongst us, had condemned him to the cross, those that loved him at the first did not forsake him, for he appeared to them alive again the third day, as the divine prophets had foretold these and ten thousand other wonderful things concerning him; and the tribe of Christians, so named from him, are not extinct at this day.

The Antiquities of the Jews, Book 18, Chapter 3 From The Works of Josephus, translated by William Whiston Hendrickson Publishers, 1987