We can start with the obvious. Orthodoxy has no room for ordained females or ordained active homosexuals.
Also, I would note that The Episcopal Church in the US came very close to being accepted as an Orthodox church around 1900.
The BCP is acceptable to the Orthodox for liturgy with a few minor changes.
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Perhaps we are generalizing. However, converts to the US Orthodox churches tend to be evangelical. See the article below and do an internet search of Peter Gillquist. There have been many, many conversion stories of evangelical pastors.
Why are so many "Becoming Orthodox"
http://www.antiochian.org/content/b...-orthodox-again-interviews-fr-peter-gillquist
I find it interesting that when these evangelicals study and are led by the Spirit, they choose the ancient church. Anglicans (including Methodists) can simply cross the Tiber. Evangelicals just don't have that option.
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Personally, I find Orthodox theology more clear than that of any of the churches, although I find John Wesley speaks best to best my heart. Whenever there is a theological issue, I know I can go to an Orthodox site for clarity.
Anglicans are so varied that it is impossible to really discuss how we differ from the Orthodox. Obviously, an evangelical, Calvinist leaning, might find Orthodoxy strange indeed. Orthodoxy considers Calvinism a heresy.
In the end Anglicanism is a western Church with much of its hangups with regard to their understanding of sin and reconciliation. But, in reality, an Anglo-Catholic is almost as far away, given the closeness to Roman understandings of sin.
Jesus died so that we can be reconciled with the Father. He rose, conquering death and the Evil One. The 7 sacraments are not to be understood mechanically; they are mysteries (form the Greek) rather than sacraments (from the Latin). For the Orthodox. If one starts with the understanding of ancestral sin, one can better understand the differences. BTW, Oden and others have found that Wesley is much closer the Orhtodoxy than others in the West.