Proof that God exists

[Amarok]

You're agnostic because you have no knowledge that a god exists.  An atheist goes beyond simple lack of knowledge with the assertion that there are no gods.  That assertion requires knowledge, evidence, rationale, something.

No they don't . An atheist can be  someone who lacks belief in god (negative atheism ) . But and agnostic atheist is someone who lacks belief in god  but claims no cetainity in his rejection . 

Negative Atheism -  A lack of belief or rejects the claim of theism 
Agnosticism - Not claiming certainty  about said rejection of theism 

I don't know why atheists take nomenclature so personally; it's just a label to succinctly convey information about an ideology.  Why does it matter if the label is spelled a+t+h+e+i+s+t or a+g+n+o+s+t+i+c???

Because ones about a lack of belief the other is about a lack of certainty . And one can be both.

fehjgsef = person who believes gods exist
fhadjkbb = person who doesn't believe anything
jgbrjebt = person who believes no gods exist.

The first is a theist (could be Agnostic or Gnostic ) 
The second is a nihilism 
The third is Positive Atheism 

Pick one.  Why does it matter how it's spelled?  Why contort atheism to mean agnosticism?

No i don't have to pick one .as they mean different things. One is a question of belief the other is a question of confidence .

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Atheism 

Positive atheism - The belief that no god exists 
Negative atheism - The rejection of the theistic claim that god exists 
Agnostic atheism - A person who lacks certainty  on the question of gods existence . 
Gnostic Atheist - A person who has certainty  no god exists