Your question is legitimate and maybe the reason people are not discussing your thoughts is that to answer is to put one's ego on the line.

To agree that God also means "I don't know" opens the speaker to the savage elements of constant doubt, wherein a soul searching would be warranted; realistically the speaker just shuts down those avenues and terminates a self exploration of one's views on the world and their own life.

My answer is as such:  Scientifically and historically God can be assumed to be mankind's created reason to explain the unknown.  As we learn more and more about the universe, those mysteries go away and we doubt that the original thought was  about a higher power.
God is therefore the great "I don't know" of our lives.

Then we have the human ego to take into this equation.  For we could not stand to exist and create anything without the thought that we have a higher purpose then merely existing, reproducing, dying and using up the earth resources. There is not a meaning to life then. Which then lends itself to the thought that we must be able change our molecular structure somehow upon death and recreate a new life or "existence" which would allow us to gain further knowledge, abstain moral greatness and with that a betterment of our current status. Thus the need for a "God" to be in existence. It allows us to be able to cross over into the unknown areas with a sense of being correct and having a knowledge that just has not been given to us at this time.

Personally, I believe in a "higher power" just not the norm of most people. I accept that in the early days of our cultures and civilization that God was enough to keep the masses together with a continuity which allowed the development of who we are today.  God's Will is still a valid thought along with a wonder and acceptance that while we may not know what the outcome is, eventually a good action will almost always be the outcome.  If people want to say it the will of God, then I am conducive to agreeing with them.  I personally believe that we are energy sources that are in transition and we have put forth a pathway before we were born that we will be bound to for the rest of our lives.  God never leaves you, God does Good and Evil, but it is a relationship between me and the God that is the battleground, do I leave my chosen path of relationship to become bitter, hard, uncaring about any relationships or do I as skillfully demonstrated in the book of Job, stay the course to find that in the long run, my relationship with God, the Universe, Jesus, Budhha, etc. will be in my benefit.

Frankly, I think that those who question religion's thoughts, motives and avenues are the great teachers.  For through your questioning comes self reflection, self doubt, self determination, and if  we let our feelings go by the wayside a greater awareness of who we are and what we should be doing for each other on the planet.

Hope this made sense.