Within Reformed theology, we recognize distinctions in the different aspects of our salvation. We first place Justification, which is the monergistic work of God's Grace (otherwise known as penal substitution/Christ dying for us on the cross). Then following Justification, we have Sanctification, which is synergistic and is only possible because of Justification, this is where we are made able to do good because of what God has already done in us. And at the end of these two, we recognize Glorification.
This is why the mantra: we have been saved (Justification) we are being saved (Sanctification) and we will be saved (Glorification) has always been a Reformed one.
In Theosis, it's more like: we hope to be saved.
Pride. In order for that to be true, all of the Reformed confession must know when they'll die and their final end. Can you tell me what day your physical death is? What do you say of the apostates of your Reformed confession?
As for Pageau, his idea that God could be "arbitrary" to create as He wills is nonsensical by definition. I do appreciate his honesty in admitting that no verse in the Bible can change his mind about these ideas that have captivated him.
ar·bi·trar·y - based on random choice or personal whim, rather than any reason or system.
That's not his idea, you're not listening to what he says, only what you would want to hear. because you see this whole thing as an exercise of your ego. God is not arbitrary. Ideologies about God are, but not God, and like it or not, an ideology is all you have when you divorce something from it's context of how it existed and developed in the world. The Reformers thought they could have morals and God without the Church, and now we have a society which thinks it can have morals without God. The next devolution will be back to pagan society without morals at all, just pure power worship.
And Jonathan takes that position probably because he realizes that words on a page don't interpret themselves. Words themselves exist as a social construct which comes into being in a time and place.
John MacArthur states in the video you linked says at roughly 1 min in "The primary question religion attempts to answer is how can I go from being "god's" enemy to his friend. How can I make peace with God, whatever that religion espouses"
Growing up agnostic, that was never on my mind, whenever God was brought up, the response was, who cares? why should I care about God at all? why would I want to? There was all sorts of suffering around me so what help is it? If it doesn't make sense, and all the problems solved by the religion are created by the religion itself, why subscribe to the religion in the first place? If it can't connect to the heart of what man is at his core, it's arbitrary by definition. the best you can have is a seemingly sound logical box faith that stands as long as you have power to enforce it, and as long as you don't touch it's presuppositions.
Calvinism is the most arbitrary of all Protestant confessions, because of it's "Unconditional Election" in it's TULIP doctrine.