Christ will return to resurrect and judge all for eternity in either heaven or hell.
Level of reward is relative to one's deeds in life. God made humans righteous by nature, but the original sin of Adam and Eve damaged that nature.
All have been saved through Christ's death, but those not "in Christ," born to God, are vulnerable to being with the devil, born to the devil.
There is no desire to create conflict between science and Christian faith.After Death God immediately judges who will experience happiness or unhappiness or temporary punishment.Those who kept faith in Christ, didn't sin after baptized or repented before death, and did good works will find happiness after death.(According to an old saying, "the Greeks built metaphysical systems; the Romans built roads.") The political aspects of the split date back to the Emperor Constantine, who moved the capital of the Roman Empire from Rome to Constantinople.Essentially the Orthodox Church shares much with the other Christian Churches in the belief that God revealed himself in Jesus Christ, and a belief in the incarnation of Christ, his crucifixion and resurrection.