The tertiary resources listed below will help enrich your understanding of the historical and cultural contexts of religion and the policy you've chosen to research. The bibliographies at the end of entries will be especially useful for getting started on your literature review.
Remember that tertiary sources are intended to fill in gaps in your knowledge or jumpstart your research; they should not be cited scholarly secondary sources for your project.
Encyclopedia of American Religions by 
Encyclopedia of Religion in America by 
Encyclopedia of the American Religious Experience by 
Encyclopedia of Women and Religion in North America by 