In crafting their beliefs and practices, Rodnovers adopt elements from recorded folk culture, including from the ethnographic record of the nineteenth and twentieth centuries. Practitioners often legitimise the incorporation of elements from folk culture into Slavic Native Faith through the argument that Slavic folk practices have long reflected the so-called "double belief" ("dvoeverie"), a conscious preservation of pre-Christian beliefs and practices alongside Christianity. This is a concept that was especially popular among nineteenth-century ethnographers who were influenced by Romanticism and retains widespread popularity across Eastern Europe, but has come under criticism in more recent times. Slavic Christianity was influenced by indigenous beliefs and practices as it was established in the Middle Ages and these folk practices changed greatly over the intervening millennia; according to this, Rodnovers claim that they are just continuing living tradition.