Salvation is not an intellectual act ... . Salvation is an existential change effected by God Himself in our lives. God became human in order to save the human condition through divinizing it. Inasmuch as we are members of His Body, we are also saved in that same divinization, theosis. The Body of Christ is the Church, the Orthodox Church with its dogmatic theology and understanding of all manner of things. It is a package deal. God in His mercy may work in other ways and places with various people, but the ideal and the only proper way that we know of in the Church, the default option, is found in the Church, where salvation is certain. Outside it, God may or may not be working with someone. Inside it, God certainly does. And part of that work is expressed in the intellectual and spiritual training accomplished by the dogmatic statements in our liturgies, hymnology, and in the Church Fathers.
For some other interesting thoughts on the issue of theosis, I accidently came accross this intersting blog post: theosis as evangelism.
Oh, and of course, I decided to google "inhabitatio dei theosis" in order to see what one of my favourite bloggers has to say about this issue and came up with the following hits (replete with learnèd comment, as usual):