Yes: extreme positions validate each other, though they don't start each other, and they act continually to consolidate each other's positions.That's entirely false, and a mischaracterization which is beneath you. Atheism is a lack of belief in gods, and where it is a denial, it is nothing more than a denial of the existence of gods. It has no position on Good or Evil or anything other than gods.
I became an atheist because of theists. Some of them were fundamentalists, but others were just garden-variety believers. Sure, religious fundamentalism creates more atheists, but you're dismissing the obvious: some people come to reject the claim that gods exist simply by testing the claims of religion and its adherents.
Fundamentalism throws fuel on the atheism fire, but it was never needed to start that fire.