... the evidence against the Flood as an historical event as described in Genesis is overwhelming.
In order to believe the Genesis account, even though some people would have you believe that there is sufficient evidence to deny it, three premises must be given:
1) Do you believe that God really exists?
2) you think he is interested in humans, his ultimate terrestrial creation
3) you believe that He is directly responsible for the production of the Bible (in its original ideas)
... Jesus is not mentioned in the Tanakh and is not recognizable as a Jewish messiah, being neither a civil, military or religious leader of the Jewish people;
...
The Messiah is not a leader Jews will produce by themselves, but a person God chooses by Himself and anoints and send/sent ... so their opinion about Jesus is intranscendental.
A relationship with God does not depend on Jews' acceptance, but in God's acceptance. Actually, if God have rejected Jews before, why is so difficult for some people to undertsand that He did it again and that time for good?
Think on this prophecy given to the Jews near 4 centuries before Jesus:
Mal. 3:
14 “You say, ‘It is of no value to serve God. How have we benefited by keeping our obligations to him and by walking somberly before Jehovah of armies?
15 Now we consider presumptuous people happy. Also, those who practice wickedness are successful. They dare to put God to the test and get away with it.’”
16 At that time those who fear Jehovah spoke with one another, each one with his companion, and Jehovah kept paying attention and listening. And a book of remembrance was written before him for those fearing Jehovah and for those meditating on his name.
17 “And
they will be mine,” says Jehovah of armies, “
in the day when I produce a special property. I will show them compassion, just as a man shows compassion to his son who serves him.
18 And you will again see the distinction between a righteous person and a wicked person, between one serving God and one not serving him.”
Why do you think God is talking about a new "special property" if the Jews had already returned from exile and rebuilt Jerusalem and its temple?
He already knew that that people was irreparable.