They're not really my assumptions, though, since my argument here is meant to be internal to some theists' theodicy, as I suggest in this article's introduction.
Can you see eternity with your eyes? What colour is it? In any case, you're making a Gnostic point, not an orthodox Christian one. God's creation of nature is supposed to have been good, contrary to the Orphics and Neo-Platonists who say the material world is inherently corrupt.
Sure, God's kingdom is supposed to be rediscovered in faith. My point is that the world God would have created includes many reasons not to exercise that faith (because the Christian creed is preposterous, for example). At best, for theists, God hides in that ambiguity of the available evidence.