"The best of the people are my generation, then those who come after them, then those who come after them." Support for this view is also found in the Qur'an, according to Sunnis. Therefore, narratives of companions are also reliably taken into account for knowledge of the Islamic faith. Sunnis also believe that the companions were true believers since it was the companions who were given the task of compiling the Qur'an. Sunni Islam does not have a formal hierarchy. Leaders are informal, and gain influence through study to become a scholar of Islamic law (sharia) or Islamic theology (Kalām). Both religious and political leadership are in principle open to all Muslims. According to the Islamic Center of Columbia, South Carolina, anyone with the intelligence and the will can become an Islamic scholar. During Midday Mosque services on Fridays, the congregation will choose a well-educated person to lead the service, known as a Khateeb (one who speaks). A study conducted by the Pew Research Center in 2010 and released January 2011 found that there are 1.62 billion Muslims around the world, and it is estimated over 85–90% are Sunni. Three group doctrines Regarding the question which dogmatic tendencies are to be assigned to Sunnism, there is no agreement among Muslim scholars. Since the early modern period, is the idea that a total of three groups belong to the Sunnis: 1. those named after Abu l-Hasan al-Aschʿari (d. 935) Ashʿarites, 2. those named after Abu Mansur al-Maturidi (d. 941) named Maturidites and 3. a differently named third group, which is traditionalistic-oriented and rejects the rational discourse of Kalām advocated by the Maturidites and Ashʿarites. The Syrian scholar ʿAbd al-Baqi Ibn Faqih Fussa (d. 1661) calls this third traditionalist group the Hanbalites. The late Ottoman thinker (d. 1946), who agreed to dividing Sunnis into these three groups, called the traditionalist group Salafiyya, but also used Athariyya as an alternative term. For the Maturidiyya he gives Nasafīyya as a possible alternative name. Another used for the traditionalist-oriented group is "people of Hadith" (ahl al-ḥadīṯ). It is used, for example, in the final document of the Grozny Conference. Only those "people of the Hadith" are assigned to Sunnism who practice tafwīḍ, i.e. who refrain from interpreting the ambiguous statements of the Quran. Ash'ari Founded by Abu al-Hasan al-Ash'ari (873–935). This theological school of Aqeedah was embraced by many Muslim scholars and developed in parts