“...you will see that any unbiased timeline will point to the RCC as the beginning Church.”
al_c, the One Holy Catholic and Apostolic Church indeed was established by Christ at Pentecost. Until 1053 the Church of Rome was not only in communion with, but indeed was the first see of that Church. Sadly, on account of papal pretensions to universal immediate jurisdiction and the adoption of innovative theologies in contradiction to the dogmatic pronouncements of the Ecumenical Councils, the Church of Rome went into schism from the other Patriarchates of The Church. The Church of Rome itself further fractured at the time of the Protestant Revolution. The Eastern Patriarchates meanwhile preserved The faith inviolate and thus were never subjected to the upheavals of an internal schism on anything like the scale the Roman Church experienced in the 16th century.
Happily, since the papacy of +Paul VI, Rome has made great gestures of reconciliation with the Orthodox and Oriental Orthodox Churches which have resulted in the hope filled dialogs in Belgrade and Ravenna. I suggest, however, that the sort of Latin triumphalism your posts have suggested only reinforce the opinions of Orthodox hierarchs, monastics and laity who are aopposed to even discussions with the Roman Church let alone a reunion.
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"Happily" indeed! It is a welcome advance for many of us.