If a nation, or tribal leader, or priest, or ordinary person had sinned, there was assurance of forgiveness when the smoke of the sacrifice ascended to God. In the New Testament the language of sacrifice helped the early Christians grasp various facets of the cross and its connection with the communion meal that Jesus instituted. Later on in Church history various theories or models of the atonement were offered to explain the cost of loving us and the freedom we now enjoy. But whatever explanation we give, the bread and wine of the communion service is designed to free us from guilt and free us for joyful service. Like the prodigal son we are welcomed home to the family table by the sacrifice of the fatted calf.
Peace is made by people of enemy languages, races, classes, and sexes eating together.
There is no sin that is too bad for God to absorb and still keep loving us. And we respond with praise and thanksgiving and prayer for others. You have given a joyful picture of the Christian life. But it can't be that easy, and it would certainly be very dangerous. Christians would lose all sense of sin and judgment.