Size & Demographic Characteristics of Religious Groups

Christians are declining, both as a share of the U.S. population and in total number, while religious "nones" continue to rise.

Explore the geographic distribution and demographics of America's major religious groups.

India is projected to have 310 million Muslims (11% of the global total), making it the country with the largest population of Muslims in the world.

The number of Christians in Europe is forecast to drop by about 100 million by 2050, while the share of Muslims and smaller religious minorities will increase.

If current demographic trends hold, by 2050, Muslims are projected to be more numerous in the U.S. than people who identify as Jewish on the basis of religion.

Demographer Conrad Hackett explains how he and his team put together our major new report and why it differs from past efforts to predict religious change.

The share of the world's Christians in Europe will continue to decline while the percentage in sub-Saharan Africa will increase dramatically.

What will the world’s religious landscape look like a few decades from now?

As of 2010, nearly a third of the world's population identified as Christian. But if demographic trends persist, Islam will close the gap by the middle of the 21st century.