While I agree, God can have mercy on whom He wishes (and thus we can never condemn anyone to hell), we can only say that salvation comes through Orthodoxy. It would be pointless for Christ to have died and established the one, true Church if people could just be saved in some other church anyways. I believe religious tolerance has led to less conversions overall, as all tolerance has done is to say, "you can obtain salvation in your church too", eliminating the need for people to search out for the Truth and convert to Orthodoxy. It isn't an issue of pride by saying Orthodoxy is the only path to salvation, but rather acknowledging that Orthodoxy is the only Church that provides all the tools and methods necessary for salvation, as it is the Church established by Christ.
Again, this is not to say that all those who weren't Orthodox before they died are in hell, God has infinite mercy and may do as He wishes. We simply can't guarantee someone who has lived outside the Church has obtained salvation (i.e., why we don't ever rule that a person in another church is a saint). Of course, just being Orthodox is no guarantee of salvation either. One must use the "tools" provided by Orthodoxy in order to save one's soul.