The theory of substitutionary atonement is particularly Western, sorry, that a fact. It relates to a particular idea of God which we don't have.
Augustine created a specific God out of various Gnostic type ideas and a misreading of Paul and Genesis II and so on. This God is no more our God than the Mayan God who required sacrifice of a heart ripped from a living body in order for the sun to rise the next day. Fine, we can say that Christ is the solution to both of these beliefs, in the first freedom for those who believe in Original Sin and a juridical relationship with God who damned all creation to being born in eternal damnation (every mortal sin damning the person to hell again) and which teaches that nature is sinful, and in the second Christ is the final sacrifice and no further victims necessary - But. But, this is not our God. And while Christ frees all from their delusions the final freedom is the freedom He gives us in a God who is always merciful, always forgiving, because our God is LOVE, and is the Good.
A good God does not require sacrifice (Isaiah), a good God does not condemn us to damnation for every sin ("neither do I condemn you, go sin no more).
We can use the same words, salvation/condemnation/justification and so on, but we relate to them in a different way from those who have a doctrine about God that is not ours as Christ taught.
This is in the fullness of truth that Christ gives us because we know Him as the Son sent by God because God so loved the world, for everyone.
There came a tendency in the early Church to promote Christianity as separated from Judaism, rather a lot got thrown out with this and very much so by Augustine who read into Paul what Paul didn't teach. Paul taught that salvation is available for everyone, he's talking about Gentiles v Jews, because God has created us with the law written in our hearts and our own conscience convicts us and all will be judged at the end according to this.
Myrrh