Social surveys—such as the World Values Survey—provide inestimably valuable cross-cultural information about people's attitudes on wide variety of topics, including religion. But brevity is the soul of such surveys, and this necessarily leaves psychologists wanting more. Perhaps more can be had.
Religion is just about everywhere, but psychologists of religion have not studied it much beyond the United States and Western Europe. The International Death Survey was a step to address this cultural myopia, focussing on religion's relationship to death.