This is an interesting and at base a Protestant read of The Faith. There is another way. Orthodoxy refuses to speculate as a general proposition on theosis outside The Church, though there are those, a minority but not an insubstantial one, who hold that there is none outside The Church, The majority, however, in accord with many of the Fathers, merely observe that we know not whither the Spirit goes and say no more. Sometimes its better to simply leave a mystery a mystery. The foregoing notwithstanding, there is no question in Orthodoxy about whether or not there is any way to the Father save through His Son.
Yes indeed, and it begs the old questions "What about unbaptized babies?" "What about aborted babies?" "What about children who lose their lives before any education or revelation to them about Christ is possible?"
The Catholic answer is: We cannot answer absolutely, because it has not been revealed to us, but we believe in a merciful and loving Father who created these children, and most of us simply cannot believe that he would cast them away into damnation for not doing what they had no choice to do. It's a mystery how God does it, but it would be consistent with everything else we know about God to have faith that he does do it.
That seems to be the Orthodox position, just expressed a little bit more positively.
I found an article about this on OrthodoxInfo:
This is a chapter from The Non-Orthodox: The Orthodox Teaching on Christians Outside of the Church. This
book was originally published in 1999 by Regina Orthodox Press in Salisbury, MA (Frank Schaeffer’s
publishing house). For the complete book, as well as reviews and related articles, go to
http://orthodoxinfo.com/inquirers/status.aspx. (© Patrick Barnes, 1999, 2004)
I. A Burning Question
In the latest edition of The Orthodox Church, Bishop Kallistos (Ware) raises the
question, “If Orthodox claim to constitute the one true Church, what then do they
consider to be the status of those Christians who do not belong to their communion?”1
For many Christians today—both Orthodox and heterodox who are seriously
contemplating a conversion to Orthodoxy—, this is a burning question.
It is typically Protestants, more than other Christians, who wrestle with this issue.
The exclusivity of the Orthodox Church—namely, Her claim to be the one and only
True Ark of Salvation (cf. 1 Peter 3:20ff) established by the Lord Jesus Christ, preserving
unadulterated the very criterion of Christianity—runs counter to everything they have
been taught about the nature of the Church. A marketing manager of a major Orthodox
publishing house specializing in “evangelistic” literature was once heard to remark that
the number of phone calls and faxes her company receives on the question of the
ecclesial and eternal status of heterodox Christians is consistently high. Many Orthodox
are interested in this issue, and this book is in part an attempt to provide a cogent
answer.
The problem with this and other questions relating to the boundaries of the Church
is that there currently exists a variety of contradictory answers. Those who have a
reasonable knowledge of the state of Orthodoxy today know that certain aspects of
ecclesiology are hotly debated. This is especially true with regard to the status of those
not in visible communion with the Church. Several decades ago, the Orthodox
theologian and ecumenical activist Nicolas Zernov made the following comment upon
this sad state of affairs:
One of the Anglican delegates [at an ecumenical gathering in Oxford in 1973], Canon
Allchin, asked the Orthodox, “Are we, according to your opinion, inside or outside of
the One Holy Catholic and Apostolic Church?” A lively discussion followed but no
answer was given, and one of the leading Orthodox theologians frankly confessed his
ignorance. He said, “I don’t know”. Such a lack of knowledge among theologians who
claim to speak in the name of the One Holy Catholic and Apostolic Church can easily
perplex those who are not familiar with the sharp disagreements among Eastern
Christians in regard to the status of other Christian confessions.2
1
Timothy [now Bishop Kallistos] Ware, The Orthodox Church (London: Penguin Books, 1993 [1963]), pp.
307-308.
2
“The One Holy Catholic and Apostolic Church and the Anglicans,” Sobornost, 6:8 (1973), p. 529.
http://www.orthodoxinfo.com/inquirers/status.aspx
The whole book is there for folks to read...