That is why agnostic is the logical position. Some people make choices to believe beyond where the facts and evidence lead --
If people maintain that god does not exist then the onus is on them to provide the evidence.
I do not wish to turn this thread into yet another atheist vs. agnostic topic (shame on you for rather gratuitously bringing it up) - there are plenty of threads for that. I merely wish to make note of the fact (for the edification of the topic originator) that the above statements, derived as they are from a sort of naive cartesianism ("we cannot 'know' anything with 100% certainty"), are not unchallenged.
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