If you raise the standards of evidence and logic you will accept to absolute, then being agnostic is the only reasonable position. But at that point you have to be agnostic about everything and end up in a solipsistic hole.

Many Agnostics are perfectly reasonable about most things, but when it comes to god suddenly raise the bar of evidence to 100%. If they don't have an absolute proof that no form of god can exist then they refuse to reject it. But have no problem rejecting other legendary figures like Santa Clause, the Tooth Fairy and competent Bush appointee.