Countless Jews have believed in and followed Jesus. But their stories were discounted by the Jewish community as aberrations from the norm. Ironically, the Gentile Church hushed up stories about Orthodox Jews who followed Jesus yet remained practicing, observant Jews, because they were an embarrassment and viewed as heretical, in spite of their beliefs.
So the Synagogue and Church have inadvertently conspired for most of history to conceal the truth.
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 cabinet 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. They treated Him like a conquering king. Then when He allowed Himself to be arrested, tried and crucified on a cursed cross, the people quit believing that He was the promised prophet. They rejected their Messiah.
The Jews also believed Jesus was a blasphemer.
Blasphemy was a serious charge under the Jewish code.
Jesus had said, when near the temple, "Destroy this Temple, and I will rear it up in three days." "But he spake of the Temple of his Body." Some of those who heard him understood him to speak of the literal temple.
This they charged was blasphemy, because it took years to build the temple, and for Jesus to rebuild it in three days would mean a claim on his part of Divine power.
So the chief-priest thought to get Jesus to commit himself in their presence and said, I adjure thee by the Living God to tell us whether thou be The Christ, the Son of God. Jesus replied that this was true, and that they would yet see him in heavenly glory and power at the right hand of Divine favor. This, the high priest declared, was sufficient proof of blasphemy.
"Behold, now ye have heard his blasphemy, What reply ye?" And the council answered that he was worthy of death. The rabble in the Court, hearing the commotion, felt at liberty to abuse the prisoner, as they had done others. They showed their contempt of him by spitting upon him.
The Jews are still waiting for their Messiah to come.
These are some of the reasons of why the Jews rejected and still reject Jesus as the Messiah.
Peace