Atheists disbelieve in Gods that humans imagine. They don’t need to prove God in order to disprove it. They just need to have sufficient evidence to disprove the existence of human-defined Gods. Anything beyond that which you would like to call “God” is nebulous, ineffable, unable to make claims about — well sure you can’t prove or disprove it because you can’t DEFINE it.

But religious texts do define “God”. So yes you can use those texts to disprove those “Gods” by for example, proving that the world wasn’t created in 6 days.

You sound like Jordan Peterson claiming that everyone believes in God because “God is the moral axiom” or something when that’s not what most people define God as. They define God as a supernatural being that has direct powers that can be influenced by prayer, who rules over an afterlife with specific conditions, who has specific laws over humans etc. And that CAN very definitely be disbelieved in.