Here are the basics for what the Jewish Messiah (Christ) is supposed to do in order to earn the title of [king] Messiah:
1. Ezekiel 37:26-28: Build the Third Temple
2. Isaiah 43:5-6: Gather all Jews back to the Land of Israel
3. Isaiah 2:4: Usher in an era of world peace, and end all hatred, oppression, suffering and disease. “Nation shall not lift up sword against nation, neither shall man learn war anymore.”
4. Zechariah 14:9: Spread universal knowledge of the God of Israel – uniting the entire human race as one: “God will be King over all the world – on that day, God will be One and His Name will be One”
The Jesus of Christianity did not accomplish any of those. As a matter of fact, the arrival of Jesus the Nazarene has meant nothing but calamity for the Jews. According to Ezekiel 37, the Messiah is supposed to build the third Temple. What happened when Jesus arrived on the scene? The Second Temple is destroyed.
According to Isaiah, the Messiah is supposed to gather all Jews back to their promised land and usher in an era of peace. What happened after Jesus? The Jews are evicted from their promised land and had it renamed to “Palestine”. Also, what has Jesus’ Christianity done to the Jews? Definitely not world peace. On the contrary, Jesus’ religion resulted in endless evictions of Jews from all around Europe: pogroms, holocausts in Protestant Germany, crusades, inquisitions – nothing but war and destruction focused against the Jews.
Contrast the actions of Jesus’ religion with another messiah that Isaiah describes in chapter 45. Cyrus the Great was considered the Messiah in Isaiah – he gathered all Jews back to Israel after the Babylonian exile and had their Temple rebuilt.
According to Zechariah, the Messiah is supposed to spread universal knowledge of the god of Israel. Jesus’ Christianity actually did the opposite: Jesus himself is worshipped as a god, and not YHWH. Of course, Christians say that they are one and the same, but YHWH had no qualms about having personal interaction with his chosen people prior to Jesus. Now all of the sudden he needs a “mediator” in his supposed literal son. It seems like an after the fact ad hoc rationalization of this disparity.
Also, Christians changed the role of God and the messiah in Judaism. In the Tanakh, YHWH makes a covenant with the Jews and ensures that they will be prosperous and have their own land. That is the one theme running throughout the Tanakh. When Christianity came along, this theme was dropped altogether and now YHWH no longer cares about the promised land or prosperity for the Jews, but is now offering the hitherto unheard of “eternal life”. And “YHWH” says that if you don’t believe in his supposed son, then you will be thrown into a firey furnace (Matt 13:50) for all eternity. The role of the Jewish messiah, an instrument of YHWH’s promise of land and prosperity for the Jews (the model of which was the Biblical Joshua, which is Jesus in Greek), was changed into a spiritual savior offering eternal life.
Now for a nice bit of irony. Tisha B’Av is the day of mourning in Jewish tradition for the destruction of both the first and second Temple. Tisha means “ninth” in Hebrew. Christianity, being a Greek and Roman religion, was originally penned in Greek. The name “Jesus Christ” in Greek is Ιησου Χριστου; Christians copying their holy books by hand would abbreviate the “sacred name” Jesus Christ as IX. And what is IX in Roman numerals? An odd coincidence…