Separatists

From Conservapedia

Separatists are men who want to separate themselves from the mainstream establishment. In American history, it often refers to the Protestants who wanted to cut all ties from the Church of England, unlike the Puritans, who wanted the Church to conform to thier standards.

The Pilgrims were Separatists who wanted to isolate from England, so they came to America to start a colony (Plymouth Colony) where their own religion was mainstream.