What are some religions that are rapidly growing worldwide?

Islam and Christianity are rapidly growing worldwide, as of 2015. Islam is estimated to increase by 73 percent between 2010 and 2050, and Christianity is expected to grow by 35 percent between 2010 and 2050, according to a study conducted by the Pew Research Center.

The Pew Research Center's estimates of Islam's rapid population expansion are based on the fact that Muslims are concentrated in regions where fertility rates are high and infant mortality rates are dropping. Similarly, the rapidly expanding Christian population in Africa is found in areas of high population growth.

The Hindu population is predicted to have the third largest increase between 2010 and 2050.