The problem with your analogy is that it still supposes we can make analogies. Even saying « we can't say anything about God » is saying something about God… Technically I can't even say, even being Christian, that God exists. That's why I have no problem with the existence of different religions and philosophyies, all, from gnostic atheism to the smallest and strangest cult, and including my own religious tradition, are infinitely wrong about God (but as in maths, there are bigger and smaller infinities).
So I can't be suprised when I learn that God cares about us in Jesus. I can't be surprised about anything about God, as any surprise would be coming from a preconception of mine.
That's an anthropocentric vision. It's hard for me to explain that in English, but what is free will essentially? The possibility for humanity to do things that God doesn't want. The nature doesn't have will of course, it doesn't choose anything, but in order to live in a world free from God, it should follow rules that God chose not to control. Thus evil is not a reality per se, but the absence of Good, which is God.