This problem isn't unique to God, in fact as Michael suggests you would find it quite challenging to prove or disprove with certainty the existence of virtually anything. I think the primary contention here is not whether absolute proof exists for objects/concepts (God) or not, but whether the likelihood of their existence and non-existence is equal given that they can't be proven for sure. **Thus, just because you can neither prove or nor disprove the existence of God does not mean the liklihood of his existence 50/50.** If people are suggesting that there is some kind of "truce" or "balance" as you put it, as if it's a coinflip as to whether God exists or not, then they have been seriously misled.