[Guille]

1. Either god exists, or not.
2. Either I believe that god exist, believe that god doesn't exist, or that we can't determine if god exists or not.
3. My beliefs must be for me parts of nature.
4. I can explain nature without the need of the idea of god.
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Therefore:
5. I don't need to belief in god to explain the universe.
6. If I belief we cannot determine whether god exists or not, then I'm always wrong, for god either exists or not (independent of whether we can determine if god exists or not).
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Therefore: Agnosticism is wrong and leads to atheism.