Either our definitions of "true faith" are very different or you are contradicting yourself. My understanding of true faith is that it is the one and only faith, all others are missing the mark. Orthodoxy isn't better or superior, it's the true faith. To be an Orthodox Christian is to believe this.
God hasn't told us what happens to faithfull of other faiths, He only tells Orthodox believers what they are to believe. I have an understanding of other faiths, but this knowledge doesn't change my belief in the true faith.