By that logic, all theories would need to be proven down to the detailed fundamentals before deemed worthy of discussion. It's like saying you have to determine the make, model and age of a car in the parking lot before you are allowed to assert that (any) car may exist in the parking lot.

But, as I have said before, I agree with you in that I don't feel the real truth of the matter can be proven externally. I choose to believe in God, but I have no 'proof' scientifically speaking.