I doubt very strongly that you've put any more thought into rejecting most gods than a baby has.The question is why do we need to have a word that encompasses distinctly different definitions. I believe no god exists, that is very, very different than a baby not believing in something because of ignorance. Ignorance is related to knowledge, atheism is related to belief. My atheism is a position. Not some state of ignorance or a lack of ability to believe.
I believe there is no intelligent, immortal being with more control over the universe than all other entities. It is a logical position. To say that this position is the same as someone incapable of belief due to an inability to posess any belief is not the same.
Many other people suggest they do not believe or disbelieve in god- that os they believe a god existing and a god not existing are equally likely. I would prefer not even having this group in the camp of atheism, but, either way, this is also completely distinct in that it is a belief regarding gods existence. No person capable of believing in a god can have a belief other than: believes a god exists, believes a god does not exist, and believes a god existing is equally likely as a god not existing. Those are the only three options. They are all positions, they are all claims. That anyone would then try to state that they are not making a claim because babies and people that have never heard of any god or conceived of any god are not making claims is an equivocation. It is dishonest; it is semantics, and the reason it happens is because the definition of atheism has been distorted.
Without googling it, please explain how you evaluated the Sumerian god Lahar and concluded that he doesn't exist.
Before I mentioned Lahar, did you have any knowledge of him at all?