Muslim world but are rapidly increasing. In the Eastern Middle East, Iran has a high level of youth literacy at 98%, whereas Iraq's youth literacy rate has sharply declined from 85% to 57%, during the American-led war and subsequent occupation. Indonesia, the largest Muslim-majority country in the world, has a very high youth literacy rate at 99%. In Afghanistan, seminaries are operated by politically active religious organizations and have taken the place of basic education not provided and funded by the government. A 2016 Pew Research Center study about religion and education around the world found that Muslims have the lowest average
Muslim world according to the Sunnah should be selected based on ٍShura (consultation), as was done at the Saqifah which selected Abu Bakr, Muhammad's father-in-law, to be Muhammad's political but not his religious successor. Shia, on the other hand, believe that Muhammad designated his son-in-law Ali ibn Abi Talib as his true political as well as religious successor. The overwhelming majority of Muslims in the world, between 87–90%, are Sunni. Shias and other groups make up the rest, about 10–13% of overall Muslim population. The countries with the highest concentration of Shia populations are: Iran – 96%, Azerbaijan – 85%, Iraq –