If change within the body means we have departed from the Gospel as originally given then no Christian today who confesses trinity, an incarnational theology and numerous other elements not clearly defined within the New Testament canon cannot be considered Christian.
As for going against Christian forums standards, am I? I recognise Protestants, Catholics and Oriental Christians as fellow Christians whom have a genuine faith. I cannot however lessen the claims of the Orthodox Church for the sake of being politically correct and acting as if I think the situation that Christendom finds itself today, that of various competing denominations not in communion with each other, is actually a good thing. It isn't.
Yes the Orthodox Church has changed in response to the ages, in response to controversies and necessarily formalised what might have been informal in the past. This however does not characterise a departure from the Gospel once given which is summed up in our confession of the Nicene creed. As for faith in Christ not being tied to Church, that is a statement I would need to see demonstrated, biblically or historically. We don't find separate communities utterly inter dependant from each other yet recognising each other as fully Christian in the early Church. There is a real concern to have unity, to not cause schism, such as when the Apostles gathered to decide the fate of us gentiles whether or not we had to become Jews. We can see the inter communion at play when Paul asks for donations for the Jerusalem Church or that in the very act of Paul writing letters to various churches he was not physically present, urging them to correct faith and teaching and unity not only with each other but with him also.
I understand this can be a sensitive topic, but if we truly want to be unified we must confront it and lay out our differences plainly.