I think there are are a number of reasons why someone becomes an atheist.
The academic who relies on their own intellect so can not believe that there maybe a being who knows and understands more than them, they are always swayed by science.
I'm sure intelligence plays a big role, if we are to believe the evidence that the most intelligent are less likely to be religious, but I suspect that it isn't about a being (of a divine nature) having greater ability than themselves but the fact that those humans espousing and promoting such don't seem to be exhibiting this - so such knowledge not passed on from such a being. That is, they might have considerable knowledge concerning the texts and doctrines of any particular faith but they might not have as much knowledge of other matters, and these often being of more value to those with more intelligence.
To add to this - for example, discrimination in any form, especially towards gender or sexuality is not an intelligent thing to do but seems to be enshrined in so many religious doctrines, and hence seems to be coming more from human thinking at the time than any divine inspiration.
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