In Glorantha, we can say that cult is the source of culture. When more than two-thirds of the adult population are initiated into the Orlanth and Ernalda cults as in Sartar, that is going to strongly define their culture. When almost half the adult population is initiated into the Ernalda cult and her immediate household (but less than a fifth are initiated into the Orlanth cult) as in Esrolia, that is also going to strongly define culture.
If we look at the breakdown of cults in any particular Gloranthan society, we can get a partial glimpse into that culture.
