The number of Christian-majority countries fell between 2010 and 2020
Countries that lost their Christian majorities all saw growing percentages of religiously unaffiliated people.
Numbers, Facts and Trends Shaping Your World
In 2020, Pew Research Center launched a new project called the National Public Opinion Reference Survey (NPORS). NPORS is an annual, cross-sectional survey of U.S. adults. Respondents can answer either by paper or online, and they are selected using address-based sampling from the United States Postal Service’s computerized delivery sequence file.