Here's something that I'd like to get an answer to.
I am surrounded by people from all sorts of churches. The professor I work under is a devout Catholic (and I frequently seek advice from him on all sorts of issues, academic or otherwise), my parents are Methodist, one of my fellow graduate assistants is a rather devout Baptist, and I have a friend who is another devout Catholic.
Furthermore, I have great admiration for people like C.S. Lewis (an Anglican) and Billy Graham (a Baptist). I also like a lot of John Wesley's teachings.
I suppose my question is that, were I to become Orthodox, how should I end up viewing people who are Christian, but not Orthodox? I recognize that there would be doctrinal differences among us to say the least that would prevent me, as a prospective Orthodox, from viewing them on the same level as an Orthodox, but at the same time, I can see that these are individuals who are/were people of deep faith and devotion to God, even if they had some errors in their beliefs.
I don't mean to be an ecumenist who would accept everyone regardless of what their church believes, but I do see that we do believe at least some of the same things. Furthermore, we certainly have a lot more in common than we do with atheists or people of other religions.
I know the Catholic church has a teaching that all churches have some truth, but the Catholic church has the fullness of truth. Is there anything similar in the Orthodox church?