I can identify with the Ephesians passage in personal spiritual and mind and heart felt experience. I associate the Eph passage very much with the mechanics of the workings between the three persons of the Godhead, just as I can witness the synchronicity of my recent studies and their lapses in this discussion.
Perhaps I am more sensitive to the explicit meanings in the words being used as I’ve been recently absorbed in word studies in Biblical epistemology, but I do perceive God intends for us to have these things available to our full understanding.
The contrapositive also provides enormous grounds for antichristian doctrines in various distorted contexts. There are probably for greater number of philosophers and theologians who are not Christian, but who might be theists, who argue God is unknowable.
I don't doubt that Satan has his minions both witting and unwitting. I reject them all. Since I am not responsible for the conversion of anyone, this is out of my purview. My job is to spread the Gospel, the Holy Spirit will take care of His part. He has a much better record than I do, He always bats 1.000.