I think I agree with what you are saying. In terms of the finitudes of human understanding, I would put it this way: the theist thinks things are as they are because that is what God wishes, but why God exists is a mystery. The materialist thinks things are as they are because of the laws of nature, but why the laws of nature are as they are is a mystery. Have I got that right?

And then there is the third option of absolute mysticism , which a human mind merges with the Infinite, and all secrets are revealed to it.

Let me add that I am focusing on the finitudes of human existence because my number one interest is political philosophy, and political philosophy is ultimately about how human beings can best handle those finitudes.