Some minority Christian denominations believe this, but not the major ones. Jesus declared, "Sins are forgiven" years before he laid down his life. Jesus taught 'Repentance' (turning away from sin to obedience to God) for the forgiveness of sin. This obedience to the will of God opens us to the power of God's grace which in turn empowers us to do God's will which in turn sanctifies/purifies the soul.
Jesus heartily believed sins are forgiven. He believed, totally, that we should discern the will of God and follow it. Christians believe the same today.
Judaism is about owning up to one's own responsibilities.
You continue to repeat Christian teachings and nothing else.
Judaism has Yom Kippur. It is the day of atonement, of forgiving one self and others. It was around during Jesus' time, so no need for Jesus to come up with some new idea when the idea already existed in Judaism.
Christians are not following Jesus. He is not a god, either to be followed or be prayed to.
Just look at the Vatican, and all extreme groups of Christianity which do nothing but be against Jews.
Again, Pogroms, the Inquisition, the Holocaust, are all examples that Christians have never followed the words of Jesus but the attacks of Paul on the Jews, accusing them of killing Jesus and keeping the world from being saved.
That is what Christianity is. An endless pursuit for salvation, for Jesus to return in person and save the world. And as long as he does not return, as he cannot, Jews will continue to be attacked.