I would suggest in the middle are agnostic theists (do not know, but tending towards belief in god) and agnostic atheists (do not know, but tending towards no belief in god). Does that make sense? Is it the same as 'weak atheists'? So are there also 'weak theists'?
I cannot comprehend how one can quantify what they do not know in any way meaningful to such a designation.
It would seem the "goodies" attached to the concept of God (i.e. everlasting life, heaven or paradise, blessings, etc.) are what one attaches their values to. Consequently the loss of of God (even conceptually) is the loss of these values as far as achieving them. The emotional deficit would be felt as a kind of mourning and depression.
I feel this. I also grieve the loss of a very awesome "friend" in God whom I spoke to and "lived with" for many years intimately. The realization that I generated my own invisible friend and proceeded to interact (albeit neurotically) with him is a double whammy.
But, since I no longer have any proof set indicating the actuality of God as either person or concept I accept the loss and retain the emotional aftermath. But, I can't quantify my Not-knowingness as strong or weak. It is simply NOT-Knowing.
T.