"It's a word necessitated by their delusion."

I totally understand how & why our remote ancestors 'delusion' was necessitated by so many things they could not comprehend. Human minds, once they could reason, however vaguely and wrongly, sought for answers.
Lightning, seasons, death, etc... were much easier to relate to by reference to unseen entities, and once prettier and more complex stories about those entities were developed, along with human interpreters, it became 'simpler' to accept the given stories rather than to continue wondering and questioning. (and often usually safer).

   Today, genuine atheism is pretty rare in societies with authoritarian regimes. In my case, I have turned down a job offer in Texas because I knew I'd eventually say the wrong thing to the wrong people at the wrong time. My habit from childhood was to question strange authoritarian assertions.