This question comes because someone asked me it, and I was stumped with regards to answering it!
Does the fact that Original Sin still exists contradict the fact that Christ’s passion renewed all of creation and defeated sin once-and-for-all?
If Christ was completely victorious as the New Adam, why does sin still exist in any form?
I’ve a feeling the answer to this would be in a similar vein to questions like ‘why do we still die?’
But I’m struggling to provide a good answer!
From the Catechism:
**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.
**
By Baptism, our first act or response in faith to God’s grace, we’re made righteous, as righteous or innocent as Adam was made. But Adam
fell, and we can still fall after being raised to newness of life, after becoming justified, too.
The purpose of this life is for us to struggle with sin, with that attraction to lesser, created things above an attraction to God first above all else, in order to find out, like Prodigals, just how good home is, how much we need God, so we’ll come running back to Him from our exile. The knowledge of good and evil, combined with grace/revelation, can help drive us to make the choice for only the ultimate Good. It’s a good fight, as St Paul said, but a hard battle, as the Catechism says. It’s designed to refine us, to bring a greater good out of the evil we all encounter, that we all
know, in this world.
**412 But why did God not prevent the first man from sinning? St. Leo the Great responds, "Christ’s inexpressible grace gave us blessings better than those the demon’s envy had taken away."307 And St. Thomas Aquinas wrote, "There is nothing to prevent human nature’s being raised up to something greater, even after sin; God permits evil in order to draw forth some greater good. Thus St. Paul says, ‘Where sin increased, grace abounded all the more’; and the Exsultet sings, ‘O happy fault,. . . which gained for us so great a Redeemer!’"308
**