Hmmmm...seems like someone might not be all that sure.
Sorry for the double post. It rarely happens but a system fluke caused it this time. God must have so ordained it. ;O)
Not really. Most atheists accept that there is a greater than zero chance that some sort of supernatural deity exists, since there is no way to rule it out completely.
In the same way, you can't rule out the possibility that one day you will be hit and killed by a meteorite falling out of the sky, even though it is extremely unlikely to happen. Since you don't spend your life constantly looking to the sky just in case a meteorite is coming, one could say that you live your life on the assumption that it won't happen to you.
In the same way, even though atheists can't be 100% sure, they believe that the existence of god, especially as defined by the world's great religions, is so improbable that its not worth worrying about in their daily lives.