Imam is an Islamic leadership position. For Sunni Muslims, Imam is most commonly used as the title of a prayer leader of a mosque. In this context, imams may lead Islamic prayers, serve as community leaders, and provide religious guidance. Thus for Sunnis, anyone can study the basic Islamic sciences and become an Imam.
Shia Islam is the second-largest branch of Islam. It holds that the Islamic prophet Muhammad designated ʿAlī ibn Abī Ṭālib as his successor (khalīfa) and the Imam after him, most notably at the event of Ghadir Khumm, but was prevented from succeeding Muhammad as the leader of the Muslims as a result of the choice made by some of Muhammad's other companions (ṣaḥāba) at Saqifah. This view primarily contrasts with that of Sunnī Islam, whose adherents believe that Muhammad did not appoint a successor before his death and consider Abū Bakr, who was appointed caliph by a group of senior Muslims at Saqifah, to be the first rightful (rāshidūn) caliph after Muhammad. Adherents of Shia Islam are called Shia Muslims.
In Islam, Taqiya or Taqiyya is a precautionary dissimulation or denial of religious belief and practice. Generally, taqiyya is the action of committing a sinful act for a pious goal.
Jaʿfar ibn Muḥammad ibn ʿAlī al-Ṣādiq, commonly known as Jaʿfar al-Ṣādiq, was an 8th-century Shia Muslim scholar, jurist, and theologian. He was the founder of the Jaʿfarī school of Islamic jurisprudence and the sixth Imam of the Twelver and Ismāʿīlī denominations of Shīʿa Islam. The traditions (ḥadīth) recorded from al-Ṣādiq and his predecessor, Muḥammad ibn ʿAlī al-Bāqir, are said to be more numerous than all the ḥadīth reports preserved from the Islamic prophet Muhammad and the other Shīʿīte Imams combined. Among other theological contributions, he elaborated the doctrine of nass and isma, as well as that of taqiya.
In Shia Islam, the Imamah is a doctrine which asserts that certain individuals from the lineage of the Islamic prophet Muhammad are to be accepted as leaders and guides of the ummah after the death of Muhammad. Imamah further says that Imams possess divine knowledge and authority (Ismah) as well as being part of the Ahl al-Bayt, the family of Muhammad. These Imams have the role of providing commentary and interpretation of the Quran as well as guidance.
Zaydism is one of the three main branches of Shia Islam that emerged in the eighth century following Zayd ibn Ali‘s unsuccessful rebellion against the Umayyad Caliphate. Zaydism is typically considered to be a branch of Shia Islam that comes closest to the Sunni, although the "classical" form of Zaydism over the centuries had changed its posture with regard to Sunni and Shia traditions multiple times, to the point where interpretation of Zaydi as Shia is often based on just their acceptance of Ali as a rightful successor to Muhammad. Zaydis regard the rationalism as more important than Quranic literalism and in the past were quite tolerant towards Sunni Shafiism, a religion of about half of the Yemenis.
The Musta‘lī are a branch of Isma'ilism named for their acceptance of al-Musta'li as the legitimate nineteenth Fatimid caliph and legitimate successor to his father, al-Mustansir Billah. In contrast, the Nizari—the other living branch of Ismailism, presently led by Aga Khan IV—believe the nineteenth caliph was al-Musta'li's elder brother, Nizar. Isma'ilism is a branch of Shia Islam.
Islamic schools and branches have different understandings of Islam. There are many different sects or denominations, schools of Islamic jurisprudence, and schools of Islamic theology, or ʿaqīdah (creed). Within Islamic groups themselves there may be differences, such as different orders (tariqa) within Sufism, and within Sunnī Islam different schools of theology and jurisprudence. Groups in Islam may be numerous, or relatively small in size. Differences between the groups may not be well known to Muslims outside of scholarly circles or may have induced enough passion to have resulted in political and religious violence. There are informal movements driven by ideas as well as organized groups with a governing body. Some of the Islamic sects and groups regard certain others as deviant or accuse them of not being truly Muslim. Some Islamic sects and groups date back to the early history of Islam between the 7th and 9th centuries CE, whereas others have arisen much more recently or even in the 20th century. Still others were influential in their time but are no longer in existence. Muslims who do not belong to, do not self-identify with, or cannot be readily classified under one of the identifiable Islamic schools and branches are known as non-denominational Muslims.
Rafida is a term used to refer to Shia Muslims who reject a number of Prophetic companions, including the first three caliphs: Abu Bakr, Umar, and Uthman. The term is sometimes lessened for only the ghulat Shia, who advocate divinity of Ali.
The Akhbārīs are a minority school of Twelver Shia Islam. The term is usually used in contrast to the majority branch of Twelver Shia – the Usuli. Like the Usulis, they follow the Quran and Hadith, but unlike them, Akhbārī reject the use of reasoning by trained Islamic jurisprudents (faqih) to derive verdicts in Islamic law, maintaining it is forbidden (haram) to follow the legal rulings of anyone but one of the "Fourteen Infallibles" of Twelver Islam.
Ali ibn Abi Talib was the cousin and son-in-law of the Islamic prophet Muhammad. Ali contributed significantly to Islam in its early years and was likely the first male to accept the teachings of Muhammad. Ali is accorded an almost legendary place in Islam as a paragon of virtues, a fount of wisdom, and a fearless but magnanimous warrior. Yet it is in Shia Islam that Ali is regarded as the foremost companion of Muhammad and his rightful successor through divinely-ordained designation at the Ghadir Khumm. When Muhammad died in 632 CE, Ali indeed had his own claims to leadership but eventually accepted the temporal rule of the first three caliphs in the interest of Muslim unity. The three caliphs are viewed in Shia Islam as illegitimate rulers and usurpers of Ali's rights. Ali himself succeeded to the caliphate in 656 but his rule was immediately challenged by multiple pretenders and he was assassinated in 661.
Sunni and Shia are different sects among Muslims and the difference of opinions have resulted in many Fatwas, non-binding but authoritative legal opinion or learned interpretation issues pertaining to the Islamic law. Fatwas are based on the question and answer process found in the Quran, which seeks to enlighten on theological and philosophical issues, hadith, legal theory, duties, and the Sharia law. Sunni fatwas have been used to justify the persecution of Shia throughout their history.
The Mahdi is a prominent figure in Islamic eschatology who is believed to appear at the End of Time to rid the world of evil and injustice. He is said to be a descendant of Prophet Muhammad, who will appear shortly before the Prophet ʿĪsā and will lead the Muslims to rule the entire world.
After the death of Muhammad in 632, a group of Muslims, who would come to be known as the Sunnis, believed that Muhammad's successor as caliph of the Islamic community should be Abu Bakr, whereas a second group of Muslims, who would come to be known as the Shias, believed that his successor should have been Ali ibn Abi Talib. This dispute spread across various parts of the Muslim world, which eventually led to the Battle of Jamal and Battle of Siffin. Sectarianism based on this historic dispute intensified greatly after the Battle of Karbala, in which Husayn ibn Ali and some of his close partisans, including members and children of the household of prophet, were killed by the ruling Umayyad Caliph Yazid I, and the outcry for revenge divided the early Islamic community, albeit disproportionately, into two groups, the Sunni and the Shia. This is known today as the Islamic schism.
Shi‘a Islam, also known as Shi‘ite Islam or Shia, is the second largest branch of Islam after Sunni Islam. Shias adhere to the teachings of Muhammad and the religious guidance of his family or his descendants known as Shia Imams. Muhammad's bloodline continues only through his daughter Fatima Zahra and cousin Ali who alongside Muhammad's grandsons comprise the Ahl al-Bayt. Thus, Shias consider Muhammad's descendants as the true source of guidance along with the teaching of Muhammad. Shia Islam, like Sunni Islam, has at times been divided into many branches; however, only three of these currently have a significant number of followers, and each of them has a separate trajectory.
Twelver Shīʿism, also known as Imāmiyya, is the largest branch of Shīʿa Islam, comprising about 85 percent of all Shīʿa Muslims. The term Twelver refers to its adherents' belief in twelve divinely ordained leaders, known as the Twelve Imams, and their belief that the last Imam, Imam al-Mahdi, lives in Occultation and will reappear as the promised Mahdi.
Criticism of Twelver Shia Islam dates from the initial ideological rift among early Muslims that led to the two primary denominations of Islam, the Sunnis and the Shias. The question of succession to Muhammad in Islam, the nature of the Imamate, the status of the twelfth Shia Imam, and other areas in which Shia Islam differs from Sunni Islam have been criticized by Sunni scholars, even though there is no disagreement between the two sects regarding the centrality of the Quran, Muhammad, and many other doctrinal, theological and ritual matters. Shia commentators such as Musa al-Musawi and Ali Shariati have themselves, in their attempts to reform the faith, criticized practices and beliefs which have become prevalent in the Twelver Shia community.
Shia Islam originated as a response to questions of Islamic religious leadership which became manifest as early as the death of Muhammad in 632 CE. The issues involved not only whom to appoint as the successor to Muhammad, but also what attributes a true successor should have. Sunnis regarded Caliphs as a temporal leaders,. To the Shiite, however, the question of succession is a matter of designation of an individual (Ali) through divine command. In the same way, Shias believed that each Imam designated the next Imam by the leave of God. So within Shia Islam it makes no difference to the Imam's position whether he is chosen as a Caliph or not.
Schools of Islamic theology are various Islamic schools and branches in different schools of thought regarding ʿaqīdah (creed). The main schools of Islamic Theology include the extant Ashʿarī, Māturīdī, and Aṯharī; the extinct ones include Qadariyah, Jahmiyya, Murji'ah, Muʿtazila, and Batiniyya.
