I am a protestant who has just begun to learn about eastern orthodoxy and eastern thought overall. For some reason, compared to other religions, it is hard to locate information that is helpful in anyway online. I have resorted to calling and speaking with leaders of these churches directly to gain a basic understanding. After talking to them, this is what I have concluded the gospel message to be according to eastern orthodoxy. Please correct me if I am wrong.
Eastern orthodoxy see original sin as a development of the west and not actually something we inherit. The fall of man did not bring about original sin; however, it did separate us from our communion with God and brought death into the world. To reconcile this, God became man, which is Jesus Christ through Incarnation. Now there is more emphasis put on the Incarnation in the east then the west from what I gathered because the Incarnation brought union back to the spiritual and physical world. (I don't recall the exact word for this, but that is the concept behind it.) Jesus became the second adam to restore creation back to communion with God. Now, eastern orthodox also differ from western thought in that they don't believe Jesus died as an atonement for sin (they claim this is also a western development). Instead, Jesus died showing that the only way we can be done completely with sin is for this flesh to die. It was His Resurrection that showed us all will be ressurrected and according to eastern orthodoxy, that is the good news of the gospel. We now spend this life working to obtain theosis, which essentially says, "God became man, so man can become like God." We do this through faith and partaking in the 7 sacraments (or mysteries) of the church. Finally, they also believe that when we die, we will all be raised and stand eternally in the presence of God. Those who grew in their love and fellowship with Him on this earth, will experience eternal joy and peace (Heaven), while those who die in a state of hardened heart will stand in His presence for eternity bitter and angry. They say that standing in the Glory of God will be a burning sensation to them (Hell). So, they don't actually believe in Heaven and Hell being separate places, rather they believe it is the state we die in and how we will react to standing in the presence of God for all eternity.
Eastern orthodoxy see original sin as a development of the west and not actually something we inherit. The fall of man did not bring about original sin; however, it did separate us from our communion with God and brought death into the world. To reconcile this, God became man, which is Jesus Christ through Incarnation. Now there is more emphasis put on the Incarnation in the east then the west from what I gathered because the Incarnation brought union back to the spiritual and physical world. (I don't recall the exact word for this, but that is the concept behind it.) Jesus became the second adam to restore creation back to communion with God. Now, eastern orthodox also differ from western thought in that they don't believe Jesus died as an atonement for sin (they claim this is also a western development). Instead, Jesus died showing that the only way we can be done completely with sin is for this flesh to die. It was His Resurrection that showed us all will be ressurrected and according to eastern orthodoxy, that is the good news of the gospel. We now spend this life working to obtain theosis, which essentially says, "God became man, so man can become like God." We do this through faith and partaking in the 7 sacraments (or mysteries) of the church. Finally, they also believe that when we die, we will all be raised and stand eternally in the presence of God. Those who grew in their love and fellowship with Him on this earth, will experience eternal joy and peace (Heaven), while those who die in a state of hardened heart will stand in His presence for eternity bitter and angry. They say that standing in the Glory of God will be a burning sensation to them (Hell). So, they don't actually believe in Heaven and Hell being separate places, rather they believe it is the state we die in and how we will react to standing in the presence of God for all eternity.