The show, as a drama is good, the costumes seem to fit the era well enough, no one knows much about religious rites and such, so the writers have a lot of latitude there. The thing that bothers me is, real vikings knew England was there, they knew France was there, they knew about Christianity. The Vikings had been raiding invading Russia since before 750. The Danes had built a wall across the southern portion of the country to keep Christians out. England was settled by the Angles, Saxons, Jutes, and Frisians, who were just earlier versions of Germanic tribes like the Scandinavians, and who mostly came to England from Jutland (Denmark). It is ridiculous to think the Vikings knew nothing of England or the British Isles or of Franconia (France).