The Elementary Forms of the Religious Life (1912)

http://durkheim.uchicago.edu/Summaries/forms.html
Hence Durkheim's definition: " A religion is a unified system of
beliefs and practices relative to sacred things, that is to say,
things set apart and forbidden -- beliefs and practices which unite
into one single moral community called a Church, all those who adhere
to them."

---SPSmith