Global, regional and country-level trends in religiosity and atheism: an update

In two earlier posts (here and here), I examined global, regional and country-level trends in religious belief and practice, and the prevalence of atheism. The analysis was based on data from the  World Values Survey (WVS) and the European Values Study (EVS), covering the period 1981 to 2020. Earlier this year, I discovered that the World Values Survey dataset has been updated. Some data collected using a mobile phone app in the most recent US survey was incorrectly coded and this mainly affected the religiosity categories.  Comparison of the US prevalences for religiosity show that the coding errors resulted in an overestimate of the atheist and non-religious categories as shown in the following table:

Comparison of religiosity prevalence estimates
 for USA in year 2020

I have now updated the previous analyses using the 2021 release of the combined data for the WVS and EVS in the Integrated Values Surveys (IVS) 1981-2021 [1-3]. In carrying out these updates, I also addressed some definitional issues which have resulted in mostly slight changes to estimates for other countries. The details of the updated analysis are described elsewhere.

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