Well, Faron's worldviews are, as NK notes, kind of odd- our most important 'god' is Haiao, the sun, who is the origin of life, light and happiness, and is entirely removed from human affairs. Phenomena are often explained through the Thaeraia earth spirits, Coraia water spirits, and Haiao, the air spirit. An example from my story a few weeks ago would be that lightning is caused by the Theraia Haefi, stealing a little piece of Haiao's fire and bringing it to earth, the following thunder being the angry shout of Graeo, who chases Haefi for the typical reasons that one usually chases a trickster spirit.
However, yes we do have a little bit of a rational, or at least humanist tradition, seeing as we believe that humans are for the most part masters of their fate.