From Orthodoxy in Dialogue, the kind of thinking that made Orthodoxy attractive to me:
However, we saw that Christ saves whom He wishes to save, with or without baptism. In other words, the work of Christ is achieved, through the Church, for those who have seen and joined the Church, and can be achieved by Christ loving whomever He wishes to love. In that, Christ does not need the church-establishment to save whomever He wishes to save. He has the ability of invoking His Spirit, His vision, and His love for all human beings, whether they belonged to organised religion or not.
In this reading you might be for Christ by His knowledge, not by yours, and therefore you have come through Him to the Father. Only the Father knows that. Your soul will not be saved in the last day unless you see the vision that Christ poured into you. In simpler terms, you will be a Christian in heaven and non-Christian on earth.
Read the whole article: Will the Non-Christian be Saved? by Metropolitan George (Khodr)