There is no original sin. It's all been done before.
God created the possibility of evil; people actualized that potentiality. The source of evil is not God's power but mankind's freedom. Even an all-powerful God could not have created a world in which people had genuine freedom and yet there was no potentiality for sin, because our freedom includes the possibility of sin within its own meaning.
The faults of which we ask you [God] the remittance, it is you who make us commit them; the traps of which we implore you to deliver us, it is you who has set them for us; and the Satan which surrounds us, this Satan, it is you.
Augustine started from God's grace and got it right, Pelagius started from human effort and got it wrong. Augustine passionately pursued God; Pelagius methodically worked to please God.
There has never been an 'original' sin: each is quite banal.
There are very few errors and false doctrines of which the beginning may not be traced up to unsound views about the corruption of human nature. Wrong views of the disease will always bring with them wrong views of the remedy. Wrong views of the corruption of human nature will always carry with them wrong views of the grand antidote and cure of that corruption.
For from the error of not knowing, or understanding, what sin is, there necessarily arises another error, that people cannot know or understand what grace is.
Evil is neither suffering nor sin; it is both at the same time, it is something common to them both. For they are linked together; sin makes us suffer and suffering makes us evil, and this indissoluble complex of suffering and sin is the evil in which we are submerged against our will, and to our horror.
