Ahmadiyya is an Islamic religious movement originating in 1889 in northern India around the teachings of Mirza Ghulam Ahmad (1835–1908), who claimed to have been divinely appointed as both the promised Mahdi and Messiah expected by Muslims to appear towards the end times.
Together, these factors make it difficult to estimate the Ahmadiyya population for both the Community itself and as well as independent organizations.
[n 2] According to the World Christian Encyclopedia, the Ahmadiyya movement is the fastest growing Islamic group as of the early 21st century.
[n 3] The country with the largest Ahmadiyya population is Pakistan, with an estimated 4 million Ahmadi Muslims.
The population is almost entirely contained in the single, organized and united movement, commonly referred to as the Ahmadiyya Muslim Community (AMC), headed by the Khalifa.