True, and it has just gone Leif Erikson Day, hasn't it? A lot of the early Scandinavian Christians were still fairly pagan, or practised both religions depending on the circumstances, since their conversion was largely political, and socially was from the top down, not affecting the the ordinary folk much for some hundreds of years. Greenland actually had a treaty with the pope, not that it did them much good, what with climate change and the plague.
Remember that early priest who wrote a letter of complaint to his superiors, about how his nominally Christian congregation would go home from church, and would then 'offer at evening to the elves'?