Mocker, a servant of the devil, laughs and claims that Jews reject Yeshua because He did not fulfill the prophecies concerning His First-Advent...why don't Jews believe in Messiah Yeshua today?

Jesus fulfilled every Messianic Prophecy concerning His First-Advent...and He will fulfill those eschatological prophecies concerning His Second-Advent.

Jacob's children today reject Messiah Yeshua primarily due to the Jewish Blood Curse. Please allow me to explain...

Elohim promised our Messiah as early as Genesis 3:15 through the womb of the virgin to circumvent Adam's sin-nature and pictured Messiah's work in the Gospel of the New Covenant as early as Genesis 3:21. Elohim sought a people group through whom He would bring forth His Messiah "to destroy the works of the Devil" (1 John 3:8b); unfortunately, the Adamic and Noahic generations defiled themselves with wickedness via immorality, murder, aberrant lust (Genesis 6:5; Romans 1:18-32); therefore, Elohim destroyed all of human kind save eight as He found Noah to be sufficiently righteous to began anew.

Through Shem, the son of Noah, Elohim brought forth a people producing the Patriarch Abram or later Abraham and Elohim made covenant with Abraham promising Him that through his seed, Abraham's seed, there would come One who would be "a blessing to every family of the Earth" (Genesis 12:3). Through the Patriarchy of Abraham, Isaac, Jacob AKA Israel, Elohim set-apart a people group through whom He would introduce His Messiah through the seed of the Tribesman Judah (a son of Israel).

Yeshua entered the Realm of Time through the Tribe of Judah and He came to the lost sheep of Israel (Matthew 15:24) in order to fulfill Elohim's promise to Abraham; this, by proselytizing the Jewish people in the "Good News" of the Gospel of peace and grace and mercy i.e. the New Covenant and preparing the Jews for the "Great Commission" as they would bless the entire Earth with the Gospel of peace and reconciliation; unfortunately, the Jewish people rejected the New Covenant established in Messiah's blood (Matthew 26:28); the Jewish people blasphemed their Messiah and His Spirit and falsely accused Him of blasphemy (Jesus proclaimed Himself Deity); the Jewish people, their leadership, conspired with the Roman authorities to arrest, brutally beat and ultimately suffocate to death their Messiah upon a Roman Cross while simultaneously exclaiming en mass that Messiah's blood be upon them and their children (Matthew 27:25); therefore, the Father took the New Covenant and the promise made to Abraham and gave same to the Gentiles until the fullness of the Gentiles have entered the Kingdom (Romans 11:25).

The Jewish people were placed under the Blood Curse in their self-righteousness as their heart was hardened and their eyes veiled and their ears made deaf (Romans 11:25; 2 Corinthians 3:15)...they were and remain a stubborn and stiff-necked people (Exodus 32:9; Deuteronomy 9:13) who continue to reject their Messiah and for this reason the prophecy of Isaiah (Isaiah 10:22) and Paul the Apostle (Romans 9:27) will come to fruition as ONLY A REMNANT of Israel's children will be saved from the "second death" in Hell due to unbelief and that remnant is primarily comprised of those proselytized by the 144,000 sanctified Jewish witnesses during the Tribulation era coming upon the Earth and also those Jews who witness Messiah's 2nd-Advent at Mount Olivette and subsequently enter the Millennial Kingdom along with their Messiah (Zechariah 12:10).

For these reasons, Jews rejected and continue to reject Messiah as they are cursed, blinded, hardened, for their disobedience and rejection of the Son sent them to be their Messiah and Lord, forever. Elohim's covenants with Israel have always been predicated upon obedience (Deuteronomy 28) and Israel's children failed Elohim repeatedly; therefore, they will reap what they have sown in disobedience (Galatians 6:7-8); therefore, DO NOT follow Israel's example but humble yourself before the Father and proclaim Jesus as YOUR Messiah who died for you and LIVE with HIM eternally (John 3; Romans 10).