Right, so what you're saying is that unlike in real world, in Yliakum people don't tend to have much closer and traditionalist communities in rural areas and they most certainly don't depend on gods more in places where tough living conditions leave their lives at nature's whim.
It also turns out hearing about gods is more of a reason to worship them than if your life simply depends on their decisions.
I'm not saying people in cities don't worship gods, but saying they have more reason to do so is absurd. Books are good for introducing you to religion, but after you finish reading one, a book won't answer your doubts. The most important source of teaching about religion are the people. Priests, family, environment. More family and environment in rural areas and more priests in cities. Now the question is what will be more influencial. People you live with, or charismatic priests you meet once in a while. Books don't even matter as in rural areas you'll have all the basics passed just by living with people.
Also before the (typical enough) misinterpretation, my point was
The source of atheism is either doubt or complete agnosis. We can rule out the latter as neither cities nor the villages here are some sort of secluded areas that common knowledge simply cannot reach. Now doubt is the heart of science. But considering Xacha are the most scientific people and yet they don't doubt the existence of Laanx, this source of atheism can be ruled out either. Atheism simply has no rational basis in the Yliakum.