heathendom

The state of being heathen.

From one religion's or creed's perspective, the rest of the world that does not follow that creed or religion.

(dated) Specifically, the non-Christian world; territories where Christianity is not the dominant religion.

(Germanic paganism, sometimes capitalized) The collection of people who follow Heathenry, a modern pagan faith inspired by the pre-Abrahamic religions of Germanic tribes, Anglo-Saxons and Norse peoples.