Most peoples within Alna have some cults or religions.
See also: Cult of Naulir
Polylatrism implies that a people worships a sub-set of gods exclusively but believes in the existence of other gods. They believe that other gods leave non-worshippers alone. A historical example we have might be the ancient Celts, which evidence suggests held a policy of "you worship your gods, we'll worship ours".
In Alna, the Hillmen are polyatrist.
The orcs are a shamanist people.