Indeed, fertility differences between religious groups are one of the key factors behind current population trends and will be important for future growth. Globally, however, the effect of religious switching is overshadowed by the impact of differences in fertility and mortality. In some countries, including the United States, it is fairly common for adults to leave their childhood religion and switch to another faith (or no faith). Not all babies will remain in the religion of their mother, of course.
Globally, all major groups had more births than deaths. Births to Muslims between 20 outnumbered deaths by 152 million (213 million births vs. Muslims experienced the greatest natural increase among all religious groups, including Christians. Adherents of folk religions, Jews and members of other religions make up smaller shares of the world’s people. Globally, Muslims make up the second largest religious group, with 1.8 billion people, or 24% of the world’s population, followed by religious “nones” (16%), Hindus (15%) and Buddhists (7%). In fact, Muslims and the unaffiliated in Europe both experienced natural increases in their populations, with our new report estimating that there were over 2 million and 1 million more births than deaths, respectively, between 20. This natural decrease in Europe’s aging Christian population was unique compared with Christians in other parts of the world and other religious groups. In Germany alone, there were an estimated 1.4 million more Christian deaths than births from 2010 to 2015. Between 20, an estimated 223 million babies were born to Christian mothers and roughly 107 million Christians died – a natural increase of 116 million.īut among Christians in Europe the reverse is true: Deaths outnumbered births by nearly 6 million during this brief period. But the report also shows that the number of Christians in what many consider the religion’s heartland, the continent of Europe, is in decline.Ĭhristians had the most births and deaths of any religious group in recent years, according to our demographic models. Christians remained the largest religious group in the world in 2015, making up nearly a third (31%) of Earth’s 7.3 billion people, according to a new Pew Research Center demographic analysis.
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