The
Catechism of the Catholic Church has a section with multiple paragraphs on Original Sin that might be worth reading. Here are two that seem to especially address your question:
404 How did the sin of Adam become the sin of all his descendants? the whole human race is in Adam “as one body of one man”.293 By this “unity of the human race” all men are implicated in Adam’s sin, as all are implicated in Christ’s justice. Still, the transmission of original sin is a mystery that we cannot fully understand. But we do know by Revelation that Adam had received original holiness and justice not for himself alone, but for all human nature. By yielding to the tempter, Adam and Eve committed a personal sin, but this sin affected the human nature that they would then transmit in a fallen state.294 It is a sin which will be transmitted by propagation to all mankind, that is, by the transmission of a human nature deprived of original holiness and justice. and that is why original sin is called “sin” only in an analogical sense: it is a sin “contracted” and not “committed” - a state and not an act.
405 Although it is proper to each individual,295 original sin does not have the character of a personal fault in any of Adam’s descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering and the dominion of death, and inclined to sin - an inclination to evil that is called concupiscence". Baptism, by imparting the life of Christ’s grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle. (
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Also from the Catechism concerning our collective responsibility for Jesus’ death:
Jews are not collectively responsible for Jesus’ death
597 The historical complexity of Jesus’ trial is apparent in the Gospel accounts. the personal sin of the participants (Judas, the Sanhedrin, Pilate) is known to God alone. Hence we cannot lay responsibility for the trial on the Jews in Jerusalem as a whole, despite the outcry of a manipulated crowd and the global reproaches contained in the apostles’ calls to conversion after Pentecost.385 Jesus himself, in forgiving them on the cross, and Peter in following suit, both accept “the ignorance” of the Jews of Jerusalem and even of their leaders.386 Still less can we extend responsibility to other Jews of different times and places, based merely on the crowd’s cry: “His blood be on us and on our children!”, a formula for ratifying a judicial sentence.387 As the Church declared at the Second Vatican Council: . . .
Neither all Jews indiscriminately at that time, nor Jews today, can be charged with the crimes committed during his Passion. . . the Jews should not be spoken of as rejected or accursed as if this followed from holy Scripture.388
All sinners were the authors of Christ’s Passion
598 In her Magisterial teaching of the faith and in the witness of her saints, the Church has never forgotten that "sinners were the authors and the ministers of all the sufferings that the divine Redeemer endured."389 Taking into account the fact that our sins affect Christ himself,390 The Church does not hesitate to impute to Christians the gravest responsibility for the torments inflicted upon Jesus, a responsibility with which they have all too often burdened the Jews alone:
We must regard as guilty all those who continue to relapse into their sins. Since our sins made the Lord Christ suffer the torment of the cross, those who plunge themselves into disorders and crimes crucify the Son of God anew in their hearts (for he is in them) and hold him up to contempt. and it can be seen that our crime in this case is greater in us than in the Jews. As for them, according to the witness of the Apostle, “None of the rulers of this age understood this; for if they had, they would not have crucified the Lord of glory.” We, however, profess to know him. and when we deny him by our deeds, we in some way seem to lay violent hands on him.391
Nor did demons crucify him; it is you who have crucified him and crucify him still, when you delight in your vices and sins.392 (
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With respect to this last part about us crucifying Jesus