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So I guess I'm making us (atheists) look bad... I know 100% that there is no God1. Much in the same way I know square circles can't exist: it's a confliction of terms.
For example God can't be all powerful AND benevolent2, because the world we live in is not a perfect one3. You don't need absolute knowledge of the universe to figure that out.
1: "God" as defined by the major religions, anyway.
2: Of course I'd say the God of the Bible is malevolent and even if He did exist He does not deserve our praise.
3: Don't you dare use the "free will" argument. Not all imperfection stems from human will; earthquakes, illness, and aging for example. Mankind's free will is physically limited anyway.