1. The country was once ruled by heathendom, but later adopted Christianity as its dominant religion.
这个国家曾经由异教教义所统治，但后来改信基督教成为主要宗教。

2. The missionaries worked tirelessly to convert the heathendom to their own faith.
传教士们不知疲倦地努力将异教徒改信他们的宗教。