As previously mentioned, the people of Cetarete have no religion. Instead, they are driven by facts and truths. One common belief among all Cetarians is that anyone who believes in a religion of any sort is ill in the brain and plagued by false truths. Though they don't say it aloud or practice theist purges, as that would be bad for business. They believe theists to be barbaric and out of touch with the world around them, as well as (especially in cases such as Buddhism, Hinduism, and other similar religions) self-centered and focused too much on getting to a heaven, pleasant afterlife, or adequate reincarnation, rather than actually living and helping the world.
How this translates to the RP: Cetarians don't openly share their hatred of religion. No nation (other than Cetarete) has knowledge of the Cetarian hate for religion. No monks, missionaries, priests, or anything of the sort are welcome in Cetarete.