Aqidah in the context of "Islamic denominations"

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).

In Islam, "the promise and threat" (waʿd wa-waʿīd) of Judgement Day (Arabic: یوم القيامة, romanized: Yawm al-qiyāmah, lit. 'Day of Resurrection' or Arabic: یوم الدین, romanized: Yawm ad-din, lit. 'Day of Judgement'), is when "all bodies will be resurrected" from the dead, and "all people" are "called to account" for their deeds and their faith during their life on Earth. It has been called "the dominant message" of the holy book of Islam, the Quran, and resurrection and judgement the two themes "central to the understanding of Islamic eschatology."Judgement Day is considered a fundamental tenet of faith by all Muslims, and one of the six articles of Islamic faith.

The trials, tribulations, and details associated with it are detailed in the Quran and the Hadith (sayings of Muhammad); these have been elaborated on in creeds, Quranic commentaries (tafsịrs), theological writing, eschatological manuals to provide more details and a sequence of events on the Day. Islamic expositors and scholarly authorities who have explained the subject in detail include al-Ghazali, Ibn Kathir, Ibn Majah, Muhammad al-Bukhari, and Ibn Khuzaymah.

Schools of Islamic theology are various Islamic schools and branches in different schools of thought regarding creed. The main schools of Islamic theology include the extant Mu'tazili, Ash'ari, Maturidi, and Athari schools; the extinct ones include the Qadari, Jahmi, Murji', and Batini schools.

The main schism between Sunni, Shia, and Khariji branches of Islam was initially more political than theological, but theological differences have developed over time throughout the history of Islam.

Maturidism (Arabic: المَاتُريدِيَّةُ, romanized: al-Māturīdiyya) is a school of theology in Sunni Islam named after Abu Mansur al-Maturidi. It is one of the three creeds of Sunni Islam alongside Ash'arism and Atharism, and prevails in the Hanafi school of jurisprudence.

Al-Maturidi codified and systematized the theological Islamic beliefs already present among the Ḥanafite Muslim theologians of Balkh and Transoxiana under one school of systematic theology (kalām); Abu Hanifa emphasized the use of rationality and theological rationalism regarding the interpretation of the sacred scriptures of Islam.

Apostasy in Islam (Arabic: ردة, romanized: ridda or ارتداد, irtidād) is commonly defined as the abandonment of Islam by a Muslim, in thought, word, or through deed. It includes not only explicit renunciations of the Islamic faith by converting to another religion or abandoning religion altogether, but also blasphemy or heresy by those who consider themselves Muslims, through any action or utterance which implies unbelief, including those who deny a "fundamental tenet or creed" of Islam. An apostate from Islam is known as a murtadd (مرتدّ).

While Islamic jurisprudence calls for the death penalty of those who refuse to repent of apostasy from Islam, what statements or acts qualify as apostasy, and whether and how they should be punished, are disputed among Muslim scholars, with liberal Islamic movements rejecting physical punishment for apostasy. The penalty of killing of apostates is in conflict with international human rights norms which provide for the freedom of religions, as demonstrated in human rights instruments such as the Universal Declaration of Human Rights, the International Covenant on Civil and Political Rights, and the International Covenant on Economic, Social and Cultural Rights provide for the freedom of religion.Until the late 19th century, the majority of Sunni and Shia jurists held the view that for adult men, apostasy from Islam was a crime as well as a sin, punishable by the death penalty, but with a number of options for leniency (such as a waiting period to allow time for repentance or enforcement only in cases involving politics), depending on the era, the legal standards and the school of law. In the late 19th century, the use of legal criminal penalties for apostasy fell into disuse, although civil penalties were still applied.