Christians the world's largest religious group

Pew Research -  Christians remained the world’s largest religious group, but their growth did not keep pace with that of the global population between 2010 and 2020. Muslims were the fastest-growing religious category and one of only two – along with religiously unaffiliated people – to increase as a share of the world’s population.

• Islam was the world’s fastest-growing religion from 2010 to 2020
• Religious composition by country, 2010-2020