Why Jews Reject Jesus?

There wasn't anything to "accept". Jesus is as irrelevant to Judaism as the objects of worship of any and all other religions.

Since Christianity is a replacement theology that purports to simultaneously negate and "fulfill" the eternal covenant of Israel, the Torah, while putting forth an antithetical and blasphemous nature of God to that in Torah and contradictory to what ALL Israel witnessed with their direct encounter with the Divine at Sinai.....why do Christians reject God's Torah ( teaching/ mitzvot)?

The New Testament rejects the nature of God, the nature of the relationship between God and man, the nature and function of the Davidic messiah, and the purpose of the eternal covenant and claims entitlement to mistranslated, misrepresent, and demonize the covenant nation people and the Holy Scriptures of Judaism.

If you are a Christian theist, the authors of that doctrine had to reject the eternal covenant of Torah to create the replacement theology of the Old and New Testament. As a monotheist who believes there is one incorporeal Creator and as a Jew, I only worship God
And because God specifically told ALL Israel who heard God in the midst of the flames, tell them God does not become a man, the dogma of the Christian replacement theology is antithetical to Torah and IT rejects God's commandments at Sinai.

If you are a Christian theist, you rejected Torah and the context of the texts that the authors of your New Testament adapted into an "Old Testament"

New Testament adherents REJECT God's commandments..given at Sinai..and do not believe that God told all Israel God does not become a man.(otherwise how could they say Jesus is God incarnate)

New Testament adherents don't follow God's covenant that affirms God is an incporporeal ONE affirmed by ALL Israel who were direct witness to God and what they heard from God when they declared Hear O Israel, the Lord is our God, the Lord is ONE

New Testament adherents reject Torah's foundation precept that is affirmed in Talmud that all humans are equal before God and equally capable to know God to believe that only those who consider Jesus as a god incarnate and believe his human sacrifice atoned for a sinful nature and all sins, may know God and merit blessing.

Christian dogma REJECTS God's Torah ( covenant/teaching) that declares human sacrifice to be an abomination and the nature of God revealed in Torah of humans being born with no burden of sin but both a good inclination and an evil inclination and the capacity to master our evil inclination.
Christians reject God telling Moses that no man may take on the sin of another.

The Christian religion's dogma of its Old and New Testament is one that claimed connection to the Holy Scriptures of Judaism to justify their own dogma, but only through display of entitlement to redefine every aspect of it and demonize Jews who refuse to abandon God's mitzvot. Christianity came about through rejection of Torah and attempts to syncretize Greek and Hellenist beliefs of savior kings and an underworld ruled by a demon deity for evil doers and negate the Jews as a distinct covenant nation people with our own laws of self-determination.

Your question is backward.

EDIT While all of the answers claiming to be from Christians here are both insulting and arrogant and not true at all, I must once again laugh at Fireball's answer that she repeats when this q is asked..
there is NO Jewish record of Jesus existing at all contemporary to his lifetime..where she gets the idea that Jews believed his body was stolen comes from her dogma..not from Jews ..and IF Jesus had been resurrected..then they're waiting on his THIRD try to do at least ONE thing God promised of the Davidic messiah as he still did absolutely nothing God promised of the messiah. There is no reason to believe he was the messiah since he failed on every account and the NT genealogy for him DISQUALIFIED him according to God's commandments in Tanakh as two of his ancestors were cursed from ever having any descendants sit on the throne as the came from wicked and sometimes even non Jewish kings..therefore..there was nothing that even made him a candidate TO reject if the NT record of him is accurate. So..they can't have it both ways. Posting fallacies here about Jews is bearing false witness

The messianic age will be one in which a humble ruler of Israel will usher in universal brotherhood, peace and all will know God and observe God's mitzvot without being taught..meaning we won't have anyone bearing false witness against us. The Christian answers to this question that lie about why Jesus is irrelevant to Judaism are actually objective evidence against their Jesus having been the messiah! and clearly show we're not in a post messianic age.

Answer: The Jews rejected Jesus because He failed, in their eyes, to do what they expected their Messiah to do—destroy evil and all their enemies and establish an eternal kingdom with Israel as the preeminent nation in the world. The prophecies in Isaiah and Psalm 22 describe a suffering Messiah who would be persecuted and killed, but the Jews chose to focus instead on those prophecies that discuss His glorious victories, not His crucifixion.

The commentaries in the Talmud, written before the onset of Christianity, clearly discuss the Messianic prophecies of Isaiah 53 and Psalm 22 and puzzle over how these would be fulfilled with the glorious setting up of the kingdom of the Messiah. After the church used these prophecies to prove the claims of Christ, the Jews took the position that the prophecies did not refer to the Messiah, but to Israel or some other person.

The Jews believed that the Messiah, the prophet which Moses spoke about, would come and deliver them from Roman bondage and set up a kingdom where they would be the rulers. Two of the disciples, James and John, even asked to sit at Jesus' right and left in His kingdom when He came into His glory. The people of Jerusalem also thought He would deliver them. They shouted praises to God for the mighty works they had seen Jesus do, and called out "Hosanna, save us" when He rode into Jerusalem on a donkey (Matthew 21:9). They treated Him like a conquering king. Then when He allowed Himself to be arrested, tried and crucified on a cursed cross, the people stopped believing that He was the promised prophet. They rejected their Messiah (Matthew 27:22).

Note that Paul tells the church that the spiritual blindness of Israel is a "mystery" that had not previously been revealed (Romans chapters 9-11). For thousands of years, Israel had been the one nation that looked to God while the Gentile nations generally rejected the light and chose to live in spiritual darkness. Israel and her inspired prophets revealed monotheism—one God who was personally interested in mankind's destiny of heaven or hell, the path to salvation, the written Word with the Ten Commandments. Yet Israel rejected her prophesied Messiah, and the promises of the kingdom of heaven were postponed. A veil of spiritual blindness fell upon the eyes of the Jews who previously were the most spiritually discerning people. As Paul explained, this hardening on the part of Israel led to the blessing of the Gentiles who would believe in Jesus and accept Him as Lord and Savior.

Two thousand years after He came to the nation of Israel as their Messiah, Christ is still (for the most part) rejected by the Jews. Many Jews today (some say at least half of all living Jews) identify themselves as Jewish but prefer to remain “secular.” They identify with no particular Jewish movement and have no understanding or affiliation with any Jewish biblical roots. The concept of Messiah as expressed in the Hebrew Scriptures or Judaism’s “13 Principles of Faith” is foreign to most Jews today.

But one concept is generally held as universal: Jews must have nothing to do with Jesus! Most Jews today perceive the last 2,000 years of historical Jewish persecution to be at the hands of so-called “Christians.” From the Crusades, to the Inquisition, to the pogroms in Europe, to Hitler’s Holocaust—Jews ultimately believe that they are being held responsible for the death of Jesus Christ and are being persecuted for that reason. They, therefore, reject Him today.

Read more: http://www.gotquestions.org/