So this will likely be a confusing post and I apologize in advance. I am a Roman Catholic actively working toward changing canonical Churches to becoming a Byzantine Catholic (Ruthenian). Are there good resources that Eastern Catholics have to share with Roman Catholics in defense of the Orthodox Church. I know many Eastern Catholics consider themselves Orthodox in communion with Rome (and while this is likely a simplistic characterization, I do not find fault with it). This said, I am on a traditional Catholic forum and am being derided for my defense of Orthodoxy. I make the claim that the Orthodox are indeed the One Holy Catholic and Apostolic Church just as much as we are (for Christ remains present in their Sacraments and still chooses to make Himself present on their altars). They bombard me with quotes from Church Fathers and Popes and different councils that condemn the idea that anyone who isn’t in communion with Rome can be part of the Church.
I know the branch theory (excluding Anglicanism since they haven’t had valid Holy Orders in centuries and centuries) is not popular among traditional Catholics or conservative Orthodox (especially the Russian Orthodox), but is becoming steadily more accepted, thanks to the work of JPII and Pope Francis as well as the Ecumenical Patriarchs over the last one hundred years.
I know that some EC communities practice inter communion with their Orthodox brethren (something Rome would likely freak out about if it was made known). How can we help our brothers and sisters in the Roman Church see the Orthodox as brothers in the faith and not schismatic/heretical/etc?