Paganism
The Nordic-Celtic religion, which came about when the Vikings invaded Ireland and mingled with the Celts and Druids, & when some Irelanders came along to Iceland with the Norse, and which "died" or more realistically slowed to a tiny trickle with the Roman invasions, is a fascinating religion. This religion worships life, nature, music, poetry, the arts, & science. Yggdrasil, the tree of life and symbol of the life force is the official worshipped entity. The thing that is most unique about Nordic-Celtisim is that there are no instances where science is in conflict with the religion, because science is a component of the religion. There is a however a mythology tied to it as a remnant of the Nordic myths and legends.
—Wolfgang