Thanks for sharing this and the video. Theosis is a new concept to me, one that I will have to mull over. As a Protestant Christian, I don't automatically accept tradition as authoritative, and the writings of the church fathers are important in my view, but not necessarily inspired or on a par with Scripture. It does seem like there may be verses that may support theosis, although I don't think any do very clearly, and certainly not as clearly as the statement "God became man so that man might become a god." Is this commonly and regularly taught in Orthodox congregations? I know that in certain Protestant congregations some topics like eschatology or sanctification get neglected, depending on the ministers. 

 Protestantism has significantly more variety in teachings than orthodoxy does. There is some variety in interpretation of what theosis means but theosis is taught within all of orthodoxy