The funny thing is that there are a lot of definitions of God, and they're all very easy to disbelieve, because they make no sense. However that just leaves you with a pile of disbelieved definitions.
That leaves you where I am, atheist-agnostic.
Aggregating all the definitions, and attempting to steamroll them into all future definitions so you arrive at positive atheism doesn't seem logical to me.
(P.S. I see you're still clicking the read button)
The way I see it, the god definition is not so random. In fact, there is a very clear pattern. The more science disproves aspects of god beliefs, the more the definition of god shrinks.
God controls weather and crops. Science discovers what really underlies the weather and agriculture production. Science is successful consistently predicting the weather and producing better and better crop yields. Praying, performing rituals, blood sacrifices, etc. do not consistently improve crop yields. Praying, performing rituals, blood sacrifices, etc. does nothing to extend lives and end suffering. Advances in medical science extends lives and eases suffering. The Bible claims pain in childbirth is punishment for Eve's original sin. Accepting Jesus is supposed to result in forgiveness of that sin. Accepting Jesus does nothing to lessen the pain of childbirth. Science develops anesthesia and eases the pain of childbirth 2,000 years after Jesus supposedly lived.
One by one science provides a natural explanation for things previously attributed to gods by humans who didn't know any better. As each scientific revelation occurs, the definition of god adjusts. It was a parable, it was symbolic, a day really meant something else, we can't know the mind of God, God has a plan we just have to trust that. It is a faith based belief and cannot be compared to an evidence based belief.
Finally god believers have nothing left. If they have been ignoring the evidence and scientific discovery, god believers simply maintain a level of denial, wherever they choose to draw the line. If they are not ignoring the scientific evidence, they adjust the definition of god until they reach a definition of a god which is beyond scientific inquiry. If science refutes every god belief, move the goalpost outside of the boundary of the game.
Now you have a god which cannot be disproved. Despite the fact science has disproved every god belief to that point and despite the fact no god belief ever started out as some untestable entity. This god is untestable because this god does nothing within the natural world. Science at this point, cannot say what happened before the Big Bang because we have no way of observing that. Well then, the definition of god must be a god who started the Big Bang then quit interacting with the Universe. Science cannot test anything that is outside of the natural Universe. Well then, god must be something outside of the Universe.
Of course all the rest of the aspects of god beliefs must either change or simply not be put together with the new definition of god in the same conscious thought. In one thought, god makes its presence known. In a separate thought, god does not interact with the Universe. In one thought, god answers prayers. In a separate thought, god does not interact with the Universe. In one thought, god inspired the Bible. In a separate thought, god does not interact with the Universe. And on it goes.....
A definition of god which does interact with the Universe should be detectable. But a god which does not interact with the Universe should have had no way to make its presence known. Then there is that absurdity of claiming god must want us to believe without evidence. There is something about this "faith" we are supposed to accept as if that pleases god (at least the Christian god anyway). There is nothing in the Bible that says believing without evidence is some key thing. In fact, time and time again the Christian god has direct interactions with humans and performs miracle after miracle. Time and time again despite these fantastic things people don't do as they are told. But I digress...
Science continues to detect no miracles. In fact, science debunks all claims of miracles when the actual evidence is examined. So the definition of a god who performs miracles most certainly will not do. God must want people to believe without any evidence whatsoever. This is now defined as the thing god must want because there is no evidence. It does not say anything in the Bible about believing in God despite overwhelming evidence the Bible is a book of myths.
But no matter. People 'know in their hearts' that there is a god. Of course the reason some people 'know in their hearts' and others have no such magical thoughts is defined as God giving people free will. Again the god definition shifts to accommodate the evidence.
In the end we have a definition of a god who does nothing and the fact such a god would by definition, be unknown to the human species is conveniently not allowed to interfere with the new definition of an undetectable god. The fact no god belief in history was of an undetectable god until that evidence against god beliefs became overwhelmingly apparent there was nothing detectable is conveniently not allowed to interfere with the new definition of an undetectable god.
And that is how the new god definition came to be known. And God was pleased.