1600 years?
What happened to the first 400 years?
Quite a sizeable gap.
And if you're ever at the Orthodox bookstore at Hellenic College in Brookline, MA, you really should pick up the little brochure there, "How to Celebrate the Divine Liturgy in About An Hour" - or something like that. I was very amused by one Orthodox priest who told our class that he omits the Litanies of the Catechumens ("We haven't got any"), and another one who told me he "reads" the silent prayers "with my eyes - Evelyn Woods' Speed Reading Dynamics". Take it easy with that "unchanging liturgy" line!
My reference point to the "one holy catholic and apostolic" church is Jesus Christ, the crucified and risen Savior who commissioned Peter and his successors, "Feed my lambs, feed my sheep, tend my sheep."
For me at least, it is a surer reference point than the one enjoyed by the three churches down the street road about 1/2 hour from here, all called Orthodox, none sharing Communion - or even a civil word, for that matter - with each other.
But based on the postings here and the words from Mt. Athos and Alexy II, civil words are in short supply on your side of the mountains.
What happened is that the Liturgy of St. James, the first Liturgy of the Church, was shortened by St. John Chrysostomos (it used to be 4 hours long -- and try standing for the entire thing) without taking out the essentials of the original. As far as I know your Church recognizes St. John Chrysostomos, so I rest my case.
As for the other anecdotal evidence you site, it is not what one father says or what even a Church Father says, it is what the Church as the Body of Christ teaches.
We know that there are apostates in both Churches, but they do not speak for nor represent the Church. You need to widen your horizons my friend.
For your information, the Orthodox recognize +Peter and his role, but not the Roman Catholic interpretation of it. You may wish to read up more on how the popes acted and how the church was before the 4th century. You will find that such "Petrine Supremacy" was not claimed by early popes, and that Petrine primacy was a different thing altogether. But that's something for another thread -- and has been regurgitated too many times to make it worthwhile.