Hi ArmyMatt
I know that Augustine had a big influence on the Catholic Church and I also wonder if it was the same for the Orthodox Church.
Augustine changed the way Original Sin was thought of.
Before him, infants were baptized but not for the same reason. After him, infants were baptized because it was believed they would go to hell due to Original Sin.
He was the church father that taught the doctrine that Original Sin was imputed to everyone....instead of it having an effect on everyone. BTW, the Catholic Church has changed its position on this stating that infants that are not baptized are left to the mercy of God. In the past it taught that they were lost.
Also, to be quite honest, I don't know of any other father that came before him that taught predestination....I argue this with the reformed and have never found a father, besides, Augustine, that taught predestination (except for some gnostics).
Anyway, any information you give would be appreciated.
Thanks!