Muslims constitute the world's second largest religious group. According to a 2010 study and released January 2011, Islam has 1.7 billion adherents, making up over 22% of the world population. According to another study in 2015 Islam has 1.7 billion adherents. Most Muslims are either of two denominations: Sunni (85-86%) or Shia (12–13%).
Islam is the dominant religion in the Middle East, North Africa, the Horn of Africa, the Sahel, and some parts of Asia. Large communities of Muslims are also found in China, the Balkans, India, and Russia. Other parts of the world host large Muslim immigrant communities; in Western Europe, for instance, Islam is the second largest religion after Christianity, where it represents 6% of the total population.
Denominations
Historically, Islam was divided into three major religious denominations well known as Sunni, Khawarij and Shī‘ah. Nowadays, Sunnis constitute more than 85% of the overall Muslim population while the Shi'as are slightly more than 12%.
This is a series of lists by country. The lists generally cover topics related to sovereign countries; however, states with limited recognition are also included.