EBSEES: 3 hits for Folk Religion

The European Bibliography of Slavic and East European Studies (EBSEES) collects books, journal articles, reviews and dissertations from Eastern Europe (former countries of Eastern Bloc) which were published in Belgium, Germany, Finland, France, Great Britain, the Netherlands, Austria and Switzerland from 1991 to 2007. The segment "Literature" and "Culture" of the European Bibliography of Slavic and East European Studies contains 18.000 bibliographic entries (from the total asset of 85.000). More information can be found here.

Your search for Folk Religion provides 3 hits
1	Ivan et Iakov - Deux saints étranges de la région des marais (Novgorod) Pančenko, Aleksandr A., in: Archives de Sciences sociales des Religions 50, 130, 2005, pp. 55-79
2	Peasants, pilgrims, and sacred promises: ritual and supernatural in Orthodox Karelian folk religion Stark, Laura, Helsinki, Finnish Literature Society, 2002, 229 p.: ill.
3	Dynamics of tradition: perspectives on oral poetry and folk belief Helsinki, Finnish Literature Society, 2003, 390 p.: ill.

The European Bibliography of Slavic and East European Studies (EBSEES) - 1991-2007

Ivan et Iakov - Deux saints étranges de la région des marais (Novgorod)

Peasants, pilgrims, and sacred promises: ritual and supernatural in Orthodox Karelian folk religion

Dynamics of tradition: perspectives on oral poetry and folk belief