Assuming a temple of Nethys located in Thuvia has a fixed curriculum for what the teach their young acolytes and this curriculum includes at least one mystical/magical language (i.e. abyssal, draconic, terran etc.), which language do you think they are most likely to teach their acolytes first?
Also, on a related notes, is "The Book of Magic" (The Nethian holy text) more likely to be written in one specific language? Giving that Nethys himself was most likely Osiriani, is ancient (or modern) osiriani considered a "sacred" (or at least more traditional) language for Nethian religious texts?
Generally speaking, Draconic is the most likely for a magical/mystical language among Wizards. Wizards can swap it for one of their normal bonus languages.
Though, it's a Nethysian temple; it could be anything really. It would be most appropriate to make decisions based on whoever's teaching the acolytes or the beliefs and culture of that particular temple.
Really, outside of valuing magic, there's not much dogma. Worshipers and temples of Nethys can be pretty varied.
