I used to go to an Orthodox church prior to my conversion, and I can tell you that there was never a more cantankorous bunch of Judaizers! Orthodoxy is a system, just like Catholicism, of salvation BY WORKS. They taught we were to TRY to ATTAIN to be saints, whereas the NT teaches all born again believers ARE saints.
They worship Mary, despite their pitiful denials, as I watched them kneel before statues(excuse me "icons"!) of her and kiss her.
Also, there is NO SUCH OFFICE in the NT as "priest", some ritualistic, sacerdotal thing. All believers are "priests" and our "rituals" are praise and worship unto Him. They call these bogus ministers "father" so and so, in DIRECT DISOBEDIENCE to our Lord Jesus Christ, who said not to call religious leaders by that title.
They also pray to "saints" another idolatrous practice that is a lie and pointless. The outfits their leaders wear fit right in this time of year. They certainly don't dress like NT believers, but like Rabbis and priests of Baal. Jesus said to beware of those that walk in long robes and desire religious titles.
They are known to persecute born again Christians in Europe and Russia, and were in cahoots with the evil Soviet Union while they wre trying to exterminate born again Christians. They don't know the Lord, for you cannot know the Lord if you are trusting in your own righteousness to save you. They do. They stumble, just like the Jews did.
I'm sorry if this sounds harsh, but it isn't, ITS THE TRUTH. Orthodoxy is simply pagan rituals and beliefs clothed in Christian terms. It is a cult, like Catholicism is.