Shia Islam in the context of "Twelver"

Sufi philosophy includes the schools of thought unique to Sufism, the mystical tradition within Islam, also termed as Tasawwuf or Faqr according to its adherents. Sufism and its philosophical tradition may be associated with both Sunni and Shia branches of Islam. It has been suggested that Sufi thought emerged from the Middle East in the eighth century CE, but adherents are now found around the world.

According to Sufi Muslims, it is a part of the Islamic teaching that deals with the purification of inner self and is the way which removes all the veils between the divine and humankind. It was around 1000 CE that early Sufi literature, in the form of manuals, treatises, discourses and poetry, became the source of Sufi thinking and meditations. Sufi philosophy, like all other major philosophical traditions, has several sub-branches, including cosmology and metaphysics, as well as several unique concepts.

The issue of succession following the death of the Islamic prophet Muhammad is the central issue in the schisms that divided the early Muslim community in the first century of Islamic history into numerous schools and branches. The two most prominent branches that emerged from these divisions are Sunni and Shia as well as Ibadi branches of Islam. Sunni Islam and Ibadi Islam asserts that Abu Bakr rightfully succeeded Muhammad through a process of election. In contrast, Shia Islam maintains that Ali ibn Abi Talib was Muhammad's designated successor.

These differing viewpoints on succession stem from varying interpretations of early Islamic history and the hadiths, which are the recorded sayings of Muhammad. Sunni Muslims contend that Muhammad did not explicitly appoint a successor, leaving the choice of leadership to the Muslim community. They recognize the legitimacy of Abu Bakr's rule, who was elected at Saqifah, as well as that of his successors, collectively known as the Rashidun caliphs.

Religious conversion is the adoption of a set of beliefs identified with one particular religious denomination to the exclusion of others. Thus "religious conversion" would describe the abandoning of adherence to one denomination and affiliating with another. This might be from one to another denomination within the same religion, for example, from Protestant Christianity to Roman Catholicism or from Shi'a Islam to Sunni Islam. In some cases, religious conversion "marks a transformation of religious identity and is symbolized by special rituals".

People convert to a different religion for various reasons, including active conversion by free choice due to a change in beliefs, secondary conversion, deathbed conversion, conversion for convenience, marital conversion, and forced conversion. Religious conversion can also be driven by practical considerations. Historically, people have converted to evade taxes, to escape military service or to gain political representation.

Kurds (Kurdish: کورد, romanized: Kurd), or the Kurdish people, are an Iranic ethnic group from West Asia. They are indigenous to Kurdistan, which is a geographic region spanning southeastern Turkey, northwestern Iran, northern Iraq, and northeastern Syria. Consisting of 30–45 million people, the global Kurdish population is largely concentrated in Kurdistan, but significant communities of the Kurdish diaspora exist in parts of West Asia beyond Kurdistan and in parts of Europe, most notably including: Turkey's Central Anatolian Kurds, as well as Istanbul Kurds; Iran's Khorasani Kurds; the Caucasian Kurds, primarily in Azerbaijan and Armenia; and the Kurdish populations in various European countries, namely Germany, France, Sweden, and the Netherlands.

The Kurdish languages and the Zaza–Gorani languages, both of which belong to the Western Iranic branch of the Iranic language family, are the native languages of the Kurdish people. Other widely spoken languages among the community are those of their host countries or neighbouring regions, such as Turkish, Persian, or Arabic. The most prevalent religion among Kurds is Sunni Islam, with Shia Islam and Alevism being significant Islamic minorities. Yazidism, which is the ethnic religion of the Kurdish-speaking Yazidi people, is the largest non-Islamic minority religion among the broader Kurdish community, followed by Yarsanism, Zoroastrianism, and Christianity.

The Jaʿfarī school, also known as the Jafarite school, Jaʿfarī fiqh (Arabic: الفقه الجعفري) or Ja'fari jurisprudence, is a prominent school of jurisprudence (fiqh) within Twelver and Ismaili (including Nizari) Shia Islam, named after the sixth Imam, Ja'far al-Sadiq. In Iran, Jaʽfari jurisprudence is enshrined in the constitution, shaping various aspects of governance, legislation, and judiciary in the country. In Lebanon, this school of jurispudence is also accounted for in the legal system of the country and Shia Muslims can call upon it for their legal disputes.

It differs from the predominant madhhabs of Sunni jurisprudence in its reliance on ijtihad, as well as on matters of inheritance, religious taxes, commerce, personal status, and the allowing of temporary marriage or mutʿa. Since 1959, Jaʿfari jurisprudence has been afforded the status of "fifth school" along with the four Sunni schools by Azhar University. In addition, it is one of the eight recognized madhhabs listed in the Amman Message of 2004 by King Abdullah II of Jordan, and since endorsed by Sadiq al-Mahdi, former Prime Minister of Sudan.

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 Sunnī Islam, there may be differences, such as different orders (tariqa) within Sufism, different schools of theology (Atharī, Ashʿarī, Māturīdī) and jurisprudence (Ḥanafī, Mālikī, Shāfiʿī, Ḥanbalī). Groups in Islam may be numerous (Sunnīs make up 87-90% of all Muslims), or relatively small in size (Ibadis, Ismāʿīlīs, Zaydīs).

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 (Barelvism, Deobandism, Salafism, Wahhabism). There are informal movements driven by ideas (such as Islamic modernism and Islamism), as well as organized groups with governing bodies (such as Nation of Islam). Some of the Islamic sects and groups regard certain others as deviant or not being truly Muslim (for example, Sunnīs frequently discriminate against Ahmadiyya, Alawites, Quranists, and sometimes Shīʿas). Some Islamic sects and groups date back to the early history of Islam between the 7th and 9th centuries CE (Kharijites, Mu'tazila, Sunnīs, Shīʿas), whereas others have arisen much more recently (Islamic neo-traditionalism, liberalism and progressivism, Islamic modernism, Salafism and Wahhabism), or even in the 20th century (Nation of Islam). Still others were influential historically, but are no longer in existence (non-Ibadi Kharijites and Murji'ah).

A confessional state is a state which officially recognises and practices a particular religion (also known as a state religion), usually accompanied by a public cult, ranging from having its citizens incentivised to do likewise through government endorsement to having public spending on the maintenance of church property and clergy be unrestricted, but it does not need to be under the legislative control of the clergy as it would be in a theocracy.

Over human history, many states have been confessional states. This is especially true in countries where Islam, Christianity, and Buddhism were the religions of the state. Until the beginning of the 20th century, many if not most nations had state religions enshrined in their respective constitutions or by decree of the monarch, even if other religions were permitted to practice.

A religious denomination is a subgroup within a religion that operates under a common name and tradition, among other activities.The term refers to the various Christian denominations (for example, non-Chalcedonian, Eastern Orthodox, Catholic, and the branches of Protestantism, such as Lutheranism). It is also used to describe the five major branches of Judaism (Karaite Judaism, Orthodox, Conservative, Reform, and Reconstructionist). Within Islam, it can refer to the branches or sects (such as Sunni and Shia), as well as their various subdivisions, such as sub-sects, schools of jurisprudence, schools of theology and religious movements.

The world's largest religious denomination is the Sunni Islam.