It isn't really about what religions have the truth and which are in error. We Christians have LOTS of error, after all, some (like this revisionist) more than others.
It's about how God went about saving a fallen world!!!! Her sent his own Son, who became man. was crucified and died, rose again, and ascended back to the Father. In Christ, we not only have forgiveness of sins, but also our very humanity is united with God!!! That is salvation, and of course there is no salvation apart from Jesus Christ. How can there be?
As for the question as to whether good people outside the Church can be saved, the orthodox have always left that in God's hands. If anyone is saved, they are saved through Christ, NOT through Quran or Buddha, and definitely not through Wiccan. Nor are they saved because some revisionist says that "there are many paths to God", which is false and presumptious.
Although we leave the question of the salvation of the world to God, we, as Christ commanded, must go out and make disciples and baptize. And even when people are saved through our evangelism, it is God's Spirit who does the saving, not us.
This typo, of course, shoud read He!!!! I'm neither going feminazi, nor do I use such bad grammar, but my typing leaves a lot to be desired.