What the Gospels claim is that Jesus was killed at the instigation of the Jewish authorities for blasphemy (claiming to be God).
Then Pilate took Jesus and had him flogged. 2And the soldiers wove a crown of thorns and put it on his head, and they dressed him in a purple robe. 3They kept coming up to him, saying, ‘Hail, King of the Jews!’ and striking him on the face. 4Pilate went out again and said to them, ‘Look, I am bringing him out to you to let you know that I find no case against him.’ 5So Jesus came out, wearing the crown of thorns and the purple robe. Pilate said to them, ‘Here is the man!’ 6When the chief priests and the police saw him, they shouted, ‘Crucify him! Crucify him!’ Pilate said to them, ‘Take him yourselves and crucify him;
I find no case against him.’ 7The Jews answered him, ‘We have a law, and according to that law he ought to die because he has
claimed to be the Son of God.’ (John 19:1-7)
Notice that Pilate, representing Rome, twice found “no case” against Jesus. Jesus was not a threat to Rome. In fact, the mockery of the soldiers clearly demonstrated this. The soldiers mocked him because they found the claim that Jesus was a threat to the power of Rome to be absurd. The sign on the cross was meant in sarcastic terms, Pilate making a point that this “King” of the Jews was a sign of the powerlessness of the Jews against Rome and a backhanded taunt at the Jewish authorities (Pilate thumbing his nose back at the Jewish authorities by saying, “Yes, this really is your king!”) Pilate even wanted to release Jesus and offered to crucify a real insurrectionist, Barabbas, in his place. If Pilate really considered Jesus to be an insurrectionist and a threat to Rome, why would he barter a guilty and convicted insurrectionist to try to get Jesus off the charge?
The reason Pilate gave in to the Jews and crucified Jesus was because he was concerned that not doing so would create a civil disobedience problem in terms of a backlash from the assembled crowd. He was “testing the waters” so to speak by offering Barabbas.
This is beside the point. What Jesus called for was a complete transformation of the heart of each human being. It was not a call to cease particular activities, but a call to purify and convert the origin of all human activity, the source of all action at the centre of each human will, which would then organically eliminate evil effects such as social or political slavery.
While it may be true that the ethical principles of Christianity are not markedly different from the moral codes central to many religions, this is not unexpected because all human beings are made in the “image” of God, the Logos or Christ, so enlightened and earnest moral seeking should arrive at the genuine principles underlying natural goodness.
The difference between Jesus and other moral teachers is not that he espoused moral doctrine, but that he claimed to BE the moral centre of each heart. To be converted means to be changed into Him, to become one with Him who is the Reality, the Logos that underpins all creation including human nature. This is not merely a moral reform as espoused by other moral teachers, but a metamorphosis into what we truly
are at the core of our being in communion with the eternal Being of God. We only become what we have been created to be when we harmonize our wills with the Absolute Truth that makes us who we are.
Jesus didn’t claim to know the way of goodness, truth or life, like other great moral teachers, He claimed to BE the Way, the Truth and the Life.
See
this video on who Jesus was
Making particular rules against specific actions, in the long run is ineffective if the human agents behind the actions only follow the rules for externally sanctioned motives. Ultimately, a change at the core of behaviour is the only lasting solution to the problem of human evil. Condemning slavery is 'only a formality" unless a real change happens in the hearts of those who profit from it or are blind to the evil it brings. Jesus was aiming to “fix” the inherent cause of the problem, not a prescription to mask the political symptoms.