User blog comment:Eustass el kid/Kuma's Bible/@comment-1940096-20140824011137/@comment-99.243.47.188-20140824030608

I seriously doubt this will ever be delved into, so it may as well be open to interpretation. But as far as technicality goes, kuma always carries a bible that he reads before sending people to new locations, anything further is speculation. As far as religion existing, I'd say it'd be safe to assume Christianity due to Usopps crucifix in thriller bark, and religion as a whole due to say, caribou.