"The Orthodox church built their theology around John Cassian, a student of Pelagius...."
Harley, that's just plain silly. +John Cassian's thought was thoroughly patristic and bible based. In any event, many of the greatest theologians of The Church, like +Athanasius the Great, +John Chrysostomos, +Basil the Great, +Gregory the Theologian, etc. etc. all were born before +John Cassian and certainly were of far greater impact on the theology of The Church than he was. Your statement is just Calvinist apologetics and fantasy.
As for your theory that John 10:11-18 supports Calvinism and somehow condemns works, that's just a Calvinist innovation. Read +John Chrysostomos' Homily LX on the Gospel of +John. Foreknowledge, Harley, doesn't equal predestination and the passage you use as a proof text hasnothing to do with works, though as you well know, the role of works in the process of theosis is well established by both scripture and the Fathers. BTW, The Fathers deal with that one too!
By the way, am I wrong in assuming that in Calvinist theology there is either no such thing as the Final Judgment, a separating of the goats from the sheep, or there is one but merely for show or to give God a chance to wreak a little "vengence"?
As for your theory that John 10:11-18 supports Calvinism and somehow condemns works
My verses were not meant to condemn works. It was meant as an example of perseverance of the saints. Our Lord Jesus is our good Shepherd who watches over us (including ourselves). It is he who keeps us by His grace and no one will snatch us out of His hand.