RE: We claim to be the ancient, original Christian Church
The issue is on the words “We Claim” and “church”.
Does one have to be part of the Greek Orthodox Church to be really in “the church” of Christ? THAT is the issue.
Orthodoxy is much broader than just ‘Greek’. The question you ask is God’s business, not mine.
WRT Sola Scriptura: I believe that those who claim that the Scriptures alone are justification, will also point out the ‘correct’ way to understand scripture. This, I think is also a ‘tradition’, albeit a shorter one, but tradition it is. It is like the issue of icons and what purpose they serve. This was resolved centuries ago by the early Church. I can somewhat understand the need to argue it in modern terms, but to what purpose? Your spiritual path does not need to be wrong in order to validate mine. I.E., if you see no devotional value of icons as part of your spiritual path, don’t do it.