What do you think the saying "There is no salvation outside the church" means then?
I think that if you want to fully understand it, you need the context.
For example
Saint Irenaeus (died A.D. 202): “[The Church] is the entrance to life; all others are thieves and robbers… We hear it declared of the unbelieving and the blinded of this world that they shall not inherit the world of life which is to come… Resist them in defense of the only true and life giving faith, which the Church has received from the Apostles and imparted to her sons.” (
Against Heresies , Book III)
Origen (died A.D. 254): “Let no man deceive himself. Outside this house, that is, outside the Church no one is saved.”
Saint Cyprian (died A.D. 258): “He who has turned his back on the Church of Christ shall not come to the rewards of Christ; he is an alien, a worldling, an enemy. You cannot have God for your Father if you have not the Church for your mother. Our Lord warns us when He says: `he that is not with Me is against Me, and he that gathereth not with Me scattereth.’ Whosoever breaks the peace and harmony of Christ acts against Christ; whoever gathers elsewhere than in the Church scatters the Church of Christ.” (
Unity of the Catholic Church )
(Much as I'm not a fan of quoting Origen, his is the most direct. And this came from a Catholic site, but these are very early quotes, centuries pre-schism.)
What do you think Origen meant, when he said that very thing in the third century? Was he saying that Baptists, and Lutherans, and Methodists couldn't be saved? There would be none of those for well over 1000 years.
The was only "the One Holy Catholic and Apostolic Church" just as we say in the Creed today. And most of the bishops never left. We are still in communion with those very same Churches mentioned in the Scriptures who still exist today.
So we know where God has promised help. We know what God established. We have the teachings of the ECFs, the desert fathers and mothers, centuries and centuries of the experiences of Saints who lived lives that made them vehicles for God's grace, even continuing as a legacy. We have the Eucharist. We have the clergy, in an unbroken line from the Lord's own Apostles. We know how God has promised His help, what He has given us. We know where God is.
Much has happened in the many centuries since then. The particular persons who rejected the Church, God knows their hearts and reasons, and their end. Only He can judge them. But in schisms upon schisms since then, you have fellowships generations removed through schism from Orthodoxy. People brought up in these fellowships who maybe never heard of Orthodoxy, but who love God and seek Him the best way they know, many of them no doubt with hearts much more fervent than mine! God knows them. God will judge them. If nothing else, they perhaps some of them achieve His grace even without the tools we have been given. So much the better they have done.
As for us, I am reminded that "to whom much has been given, much is required". We are responsible for the greater help we have received, to do more with it, perhaps.
It seems to me (maybe I'm wrong) that you're looking for a simple answer regarding that quote. There isn't one. The Church has not ruled on our relationship to the non-Orthodox, except we do know that they are often received by Chrismation alone if they were already baptized so ... that tells you a little. If they were baptized by pagans, it wouldn't be accepted - just as we don't accept the baptisms of some, like Jehovah's Witnesses and Mormons, because of their errors about Christ.
But there is not a simple straight line answer dividing "who's in" from "who's out" because that is ultimately God's business, not ours.
I am sure I know Orthodox Christians who will be saved. I believe I also know Christians of other kinds who will be saved.
I fear there are Orthodox who are lost. I fear there are those who belong to other groups who are lost. Perhaps God will save even them before it's all over. Only He knows.
It's a messy answer, but that's what there is. Only God judges. We try to presume neither way for anyone. The best we can know is if we are truly working out our own salvation right now, or not.
Forgive me if this isn't what you want.