What is folk religion?
Folk religion, or folkism, is the collection of spiritual, metaphysical, religious, and magical beliefs held by the white tribes of pre-Christian Europe. We don't really know a whole lot about what our ancestors believed, because Christianity was very effective at destroying their folkish traditions, decrying all that preceded Christianity as heretical and "pagan."
Pieces of our history have been preserved, despite Christianity's attempts to prevent it. The most well-known artifact is the Icelandic Edda, which is a small collection of 13th-century Icelandic literature detailing the beliefs and practices of the prehistoric Norse people.