Are spirits an inherently magical concept?

The Geminate Invoker Barbarian archetype involves inviting spirits into your body to gain totem rage powers, but RAW nothing about it directly contradicts the Superstition tree of rage powers, which focuses on rejecting and sundering all sorts of spells and enchantments.

That being said, would a barbarian that hates magic but also lets spirits power him up be a walking contradiction of a class? Just how magical are spirits considered in a world of high fantasy?