The Profits of Religion An Essay in Economic Interpretation is a thought-provoking non-fiction work by Upton Sinclair, first published in 1917. This compelling analysis examines the landscape of religious movements in the United States just before its entry into World War I. Sinclair critiques institutionalized religion, portraying it as a source of income to parasites and an ally of various forms of oppression and exploitation. His powerful arguments challenge readers to reconsider the role of religion in society.