Cross-country data on the number of religions

Barrett, D. B., Kurian, G. T. & Johnson, T. M. 2001

World Christian Encyclopedia 2nd edition (by Barrett et al., Oxford University Press, 2001) provides the number of religions in each country. The digitized version appears to be available at World Christian Database (which requires subscription).

Used by Fincher and Thornhill (2008) to investigate if infectious diseases predict the variety of religion in a country.