Islam

Islam is the second largest religion in the Netherlands, after Christianity, and is practised by 6% of the population according to 2023. estimates. The majority of Muslims in the Netherlands belong to the Sunni denomination. Many reside in the country's four major cities: Amsterdam, Rotterdam, The Hague and Utrecht.

The early history of Islam in the Netherlands can be traced back to the 16th century, when a small number of Ottoman merchants began settling in the nation's port cities. As a result, improvised mosques were first built in Amsterdam in the early 17th century. In the ensuing centuries, the Netherlands experienced sporadic Muslim immigration from the Dutch East Indies, during their long history as part of the Dutch overseas possessions. From the dissolution of the Ottoman Empire after the First World War until the independence of Indonesia, the Dutch East Indies contained the world's second largest Muslim population, after British India. However, the number of Muslims in the European territory of the Kingdom of the Netherlands was very low, accounting for less than 0.1% of the population.

Ilm al-kalam or ilm al-lahut, often shortened to kalam, is the scholastic, speculative, or rational study of Islamic theology (aqida). It can also be defined as the science that studies the fundamental doctrines of Islamic faith (usul al-din), proving their validity, or refuting doubts regarding them rationally via logic. Kalām was born out of the need to establish and defend the tenets of Islam against philosophical doubters and non-Muslims, and also to defend against heretical and religious innovations (bidʿah). A scholar of kalam is referred to as a mutakallim (plural mutakallimun), a role distinguished from those of Islamic philosophers and jurists.

After its first beginnings in the late Umayyad period, the Kalām experienced its rise in the early Abbasid period, when the Caliph al-Mahdi commissioned Mutakallimūn to write books against the followers of Iranian religions, and the Barmakid vizier Yahya ibn Khalid held Kalām discussions with members of various religions and confessional groups in his house. By the 10th century, the Muʿtazilites were main pioneers of 'Kalam' during the early formative period of Islam. However, due to increased criticism by traditionalist Muslim scholars that the Mu'tazilites started departing from mainstream Sunni orthodoxy, they were refuted heavily. Soon after, two new important Sunni Kalām schools emerged: the Ashʿaris and the Maturidis. They positioned themselves against the growing Neoplatonic and Aristotelian philosophy within the Mu'tazilites and elevated the "Kalām science" (ʿilm al-kalām) as an acceptable ranking science in mainstream Sunni discourse. Some of the arguments of these Mutakallimūn also found their way into Jewish and Christian theological discussions in the Middle Ages. Kalām science by the early modern period was essentially limited to the study of manuals and commentaries, from the late 19th century onwards various reform thinkers appeared in British India and the Ottoman Empire who called for the founding of a "new Kalām".

Serbs of Bosnia and Herzegovina or Bosnian Serbs, are one of the three constituent peoples of Bosnia and Herzegovina. According to data from the 2013 census, the population of ethnic Serbs in Bosnia and Herzegovina was 1,086,733, constituting 30.8% of the total population; they are the second-largest ethnic group in the country (after Bosniaks) and live predominantly in the political-territorial entity of Republika Srpska.

Serbs have a long history of inhabiting the present-day territory of Bosnia and Herzegovina as well as long history of statehood in that territory. Slavs settled the Balkans in the 6th century and the Serbs were one of the main tribes who settled the peninsula including parts of modern-day Bosnia and Herzegovina. Parts of Bosnia were ruled by the Serbian prince Časlav in the 10th century while the southeastern and eastern parts became integrated into the Serbian medieval state under the Nemanjić dynasty by the 13th-14th centuries. After the Ottoman conquest of Bosnia and Herzegovina, the majority of the Orthodox Christian population in the region retained their Serbian ethnic and religious identity under the restored Serbian Patriarchate of Peć, while many landowners converted to Islam. Throughout the period of Ottoman rule, the Serbs of Bosnia and Herzegovina, formed the core of several major uprisings against Ottoman rule. In 1878, following the Congress of Berlin, Austria-Hungary occupied Bosnia and Herzegovina, facing resistance from the Serb population, which increasingly aspired to unification with the Kingdom of Serbia, culminating in growing tensions that contributed to the assassination of Archduke Franz Ferdinand in Sarajevo, which triggered the World War I.

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.

The most widely professed religion in Bosnia and Herzegovina is Islam and the second biggest religion is Christianity. Nearly all the Muslims of Bosnia are followers of the Sunni denomination of Islam; the majority of Sunnis follow the Hanafi legal school of thought (fiqh) and Maturidi theological school of thought (kalām). Bosniaks are generally associated with Islam, Croats of Bosnia and Herzegovina with the Catholic Church, and Bosnian Serbs with the Serbian Orthodox Church. The State Constitution of Bosnia and Herzegovina (BiH) and the entity Constitutions of the Federation of Bosnia and Herzegovina and the Republika Srpska provide for freedom of religion, and the Government generally respects this right in ethnically integrated areas or in areas where government officials are of the majority religion; the state-level Law on Religious Freedom also provides comprehensive rights to religious communities. However, local authorities sometimes restricted the right to worship of adherents of religious groups in areas where such persons are in the minority.

Government protection of religious freedom declined, especially during the campaign period prior to the October 2006 national elections, due to selective legal enforcement and the indifference of some government officials. At the end of the period covered by this report, the Government was implementing the State Law on Religious Freedom to protect the rights of religious communities and create a government registry allowing them to establish legal status.

Albania is a secular and religiously diverse country with no official religion and thus, freedom of religion, belief and conscience are guaranteed under the country's constitution. In the 2023 census, Islam is the most common religion in Albania, followed by around 51% of the total population, mostly Sunni Muslims and a minority of Bektashians. Christianity is the second-largest religion with a population of 16%, including Catholics, Eastern Orthodox and Evangelicals. However, religiosity is generally low in Albania and irreligious (Atheists and the other non-religious) were 17%. The other 16% were undeclared.

Religion in Turkey consists of various religious beliefs. While Turkey is officially a secular state, numerous surveys all show that Islam is the country's most common religion. According to the state, 99.8% of the population is initially registered as Muslim. The remaining 0.2% are Christians and adherents of other officially recognised religions such as Judaism. However, because the government registers everyone as Muslim at birth by default, the official statistics can be misleading. There are many people who follow other religions or do not adhere to any religion, yet they are officially classified as 'Muslim' in official records unless they make a contrary claim. These records can be changed or even blanked out on the request of the citizen using a valid electronic signature to sign the electronic application. According to a 2025 report from Pew Research Center, 95% of Turkey self-identified as Muslim. A significant percentage of those are non-observing Cultural Muslims.

Turkey has officially been a secular country since its 1924 constitution was amended in 1928. This was later strengthened and entrenched with the wider appliance of laicism by founder Atatürk during the mid-1930s, as part of the Republican reforms. Strict regulations on religion, including a ban on Islamic attire, were imposed. The rights of Armenian Apostolic, Greek Orthodox, and Jewish citizens were recognized under the Treaty of Lausanne.

Islam is the majority religion in Azerbaijan. Estimates include 97.3% in 2020 by The World Factbook and 99.2% in the 2006 Demographic and Health Survey according to Pew Research Center of the population identifying as Muslim. A majority of them belong to the Shia branch (55–65% of Muslims), while a significant minority (35%–45%) are Sunni. Traditionally, the differences between these two branches of Islam have not been sharply defined in Azerbaijan.

Shia Muslims in the country typically adhere to the Ja'fari school of Shia Islam, while most Sunni Muslims either the Hanafi or Shafi'i school. Due to many decades of Soviet atheist policy, Muslim religious affiliation in Azerbaijan is largely cultural and ethnic rather than religious. Shia Islam is prevalent in the western, central, and southern regions of the country. Traditionally, villages around Baku and the Lankaran region are considered Shia strongholds. In contrast, Sunni Islam is dominant in the northern regions.

The Abrahamic religions are a set of monotheistic religions that respect or admire the religious figure Abraham, namely Judaism, Christianity, and Islam, though the term also often encompasses several smaller faiths. The religions of this set share doctrinal, historical, and geographic overlap that contrasts them with Indian religions, Iranian religions, and East Asian religions. The term, introduced in the 20th century, replaced "Judeo-Christian" to include Islam as an Abrahamic religion and acknowledge differences between Judaism and Christianity. However, it has been criticized for oversimplifying cultural and doctrinal nuances.

Sunni Islam is the largest branch of Islam and the largest religious denomination in the world. It holds that Muhammad did not appoint any successor and that his closest companion Abu Bakr (r. 632–634) rightfully succeeded him as the caliph of the Muslim community, being appointed at the meeting of Saqifa. This contrasts with the Shia view, which holds that Muhammad appointed Ali ibn Abi Talib (r. 656–661) as his successor. Nevertheless, Sunnis revere Ali, along with Abu Bakr, Umar (r. 634–644) and Uthman (r. 644–656) as 'rightly-guided caliphs'.

The term Sunni means those who observe the sunna, the practices of Muhammad. The Quran, together with hadith (especially the Six Books) and ijma (scholarly consensus), form the basis of all traditional jurisprudence within Sunni Islam. Sharia legal rulings are derived from these basic sources, in conjunction with consideration of public welfare and juristic discretion, using the principles of jurisprudence developed by the four predominant legal schools: Hanafi, Maliki, Shafi'i and Hanbali.