It's precisely b/c of the mindset revealed by followers of Rome and Constantinople in biblical discussion that the notion of reuniting w/ them in spiritual communion is unthinkable for the believer in the faith revealed in the Bible.
Consider the convo I had just last night w/ an EO acquaintance (not him but rather a mutual friend) over AIM chat.
We small talked a bit about our pasts and his seminary experience and such (he has an MDiv from an Eastern Orthodox seminary and is EO himself). I then expressed my thankfulness for my local church and for the fact that we are not following a large trend in the SBC (discussed often here, here, and here as well as numerous other places).
Which led him to share about his experience at his EO baptism. Which led me to ask him whether he shares that testimony and the Gospel w/ unbelievers. His answer began to indicate a problem: Not usually directly, but he invites people to come to church or to pray, and he tells them that his faith in Christ has changed his life.
Is that the Gospel, friends?
So I asked him about that, commenting that people do need to hear the Gospel. (The fact that the Gospel is "the power of God" went unmentioned, but that's why I said that.)
He protested that this can be too direct, that he was "not sure that being more direct would necessarily work", that such an approach might alienate the unbeliever more.
Now, perhaps he meant just walking up to people and cold-preaching at them, and I can understand his thinking, though I'm unconvinced that such an approach is necessarily wrong. But I DID bring up the fact that unbelievers are "enemies of God" by bringing up Romans 8:6-8.
ME: "if they loved Him then they would love His Son and they would be Christians"
ME (later): more curious about how you interpret "the sinful mind is hostile to God" as anythg other than that; i just quoted the psg, didn't interp it at all
And that's the key - I quoted Scripture to him several times, and each time he responded w/ what boils down to "your interpretation is wrong". But friends, I didn't interpret it at all! I just quoted it, he felt the force of the divine words and tried to squirm away from them. No wonder Heb 4:12 is in there too.
He then asked me how I can assume off the bat that people hate God. I pointed out that Rom 8 says the mind set on the flesh is death.
This brought us to the crux of the matter, and I'll paraphrase:
HE: If someone is seeking the truth
ME: enemies of God are not seeking, no one seeks God
HE: That is ridiculous. (Now I will quote him:) "that is totally heretical"
ME: you just called a direct quotation from Romans 3 heretical
HE: You took that out of context.
ME: the very next verse explains: 19Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world held accountable to God. i don't deny that He calls all
HE: That is talking about Jews.
ME: But it says "EVERY MOUTH." Talk about missing context. You can't even see it in the same verse.
Now, I don't think that he really believes the Apostle Paul to have been a heretic, but notice his visceral reaction to my quoting Scripture to him to the effect that all men are enemies of God, hate God, and are not seeking Him. To him the obvious conclusion of the Romans 3 passage is a terrible, heretical idea!
This is what the Lord Jesus warned us about - putting the traditions of men over the Word of God.
Do we react violently against what God has said? Do we jump to calling it evil, overly pious, too rigorous? Are we not putting ourselves in the unenviable position of judging the Judge of the universe?
As long as this attitude prevails among our Roman Catholic and Eastern Orthodox friends, that's all they will remain - friends. I cannot call brother one who rejects the Word of God in such a way. May God help him.