Pew Research Center in the context of Latin American Muslims

Christianity is the predominant religion in Europe. Christianity has been practiced in Europe since the first century, and a number of the Pauline Epistles were addressed to Christians living in Greece, as well as other parts of the Roman Empire.

According to a 2010 study by the Pew Research Center, 76.2% of the European population identified themselves as Christians.

In 2020, 85.84% of the population in Georgia adhered to Christianity (mainly Georgian Orthodox), 11% were Muslim, 0.1% were Jewish, 0.04% were Baháʼí and 3% had no religious beliefs. Other religious groups include Jehovah's Witnesses and Yazidis. Orthodox churches serving other non-Georgian ethnic groups, such as Russians and Greeks, are subordinate to the Georgian Orthodox Church.

A Pew Research Center study about religion and education around the world in 2016, found that between the various Christian communities, Georgia ranks as the third highest nation in terms of Christians who obtain a university degree in institutions of higher education (57%).

A Christian (/ˈkrɪstʃən, -tiən/ ) is a person who follows or adheres to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. Christians form the largest religious community in the world. The words Christ and Christian derive from the Koine Greek title Christós (Χριστός), a translation of the Biblical Hebrew term mashiach (מָשִׁיחַ) (usually rendered as messiah in English). While there are diverse interpretations of Christianity which sometimes conflict, they are united in believing that Jesus has a unique significance. The term Christian used as an adjective is descriptive of anything associated with Christianity or Christian churches, or in a proverbial sense "all that is noble, and good, and Christ-like."

According to a 2011 Pew Research Center survey, there were 2.3 billion Christians around the world, up from about 600 million in 1910. Today, about 37% of all Christians live in the Americas, about 26% live in Europe, 24% live in sub-Saharan Africa, about 13% live in Asia and the Pacific, and 1% live in the Middle East and North Africa. Christians make up the majority of the population in 158 countries and territories. 280 million Christians live as a minority. About half of all Christians worldwide are Catholic, while more than a third are Protestant (37%). Eastern Christians, including the Eastern Orthodox, Oriental Orthodox, and Church of the East, comprise 12% of the world's Christians. Other Christian groups make up the remainder. By 2050, the Christian population is expected to exceed 3 billion due to overall total fertility rate according to Pew Research Center. According to a 2012 Pew Research Center survey, Christianity will remain the world's largest religion in 2050, if current trends continue. In recent history, Christians have experienced persecution of varying severity, especially in the Middle-East, North Africa, East Asia, and South Asia.

According to a Pew estimation in 2025, Christians made up to 2.3 billion of the worldwide population of about 8 billion people. This represents nearly one-third of the world's population and is the largest religion in the world, with the three largest groups of Christians being the Catholic Church, Protestantism, and the Eastern Orthodox Church. The largest Christian denomination is the Catholic Church, with 1.3 billion baptized members. The second largest Christian branch is either Protestantism (if it is considered a single group), or the Eastern Orthodox Church (if Protestants are considered to be divided into multiple denominations).

According to a 2020 Pew Research Center study, of the then 201 countries and territories, 120 had Christian majorities, four fewer than in the 2010 study.

Adherents of Islam constitute the world's second largest and fastest growing major religious grouping, maintaining suggested 2017 projections in 2022. As of 2020, Pew Research Center (PEW) projections suggest there are a total of 2 billion adherents worldwide. Further studies indicate that the global spread and percentage growth of Islam is primarily due to relatively high birth rates and a youthful age structure. Conversion to Islam has no impact on the overall growth of the Muslim population, as the number of people converting to Islam is roughly equal to the number of those leaving the faith.

Most Muslims fall under either of three main branches:

New York City has been called the media capital of the world. The media organizations based in New York City are internationally influential and include some of the most important newspapers, largest publishing houses, biggest record companies, and most prolific television studios in the world. It is a major global center for the book, magazine, music, newspaper, and television industries. A 2019 Pew Research Center report found that 12 percent of all U.S. newsroom employees live in New York City, disproportionately higher than the 7 percent of the U.S. working-age population that lives in New York City.

New York is also the largest media market in North America (followed by Los Angeles, Chicago, and Toronto). Some of the city's media conglomerates include CNN (CNN Global), the Hearst Corporation, NBCUniversal, The New York Times Company, the Fox Corporation and News Corp, the Thomson Reuters Corporation, and Warner Bros. Discovery. Seven of the world's top eight global advertising agency networks are headquartered in New York. Three of the "Big Four" record labels are also headquartered or co-headquartered in the city. One-third of all American independent films are produced in New York. More than 200 newspapers and 350 consumer magazines have an office in the city and the book-publishing industry employs about 25,000 people.

Non-denominational Muslim (Arabic: مسلمون بلا طائفة) is a Muslim who does not belong to, does not self-identify with, or cannot be readily classified under one of the identifiable Islamic schools and branches. Such Muslims do not think of themselves as belonging to a denomination but rather as "just Muslims" or "non-denominational Muslims." Muslims who do not adhere to a sect are also known as non-sectarian Muslims.

While the majority of the population in the Middle East identify as either Sunni or Shi'a, a significant number of Muslims identify as non-denominational. According to a 2012 study by the Pew Research Center, Muslims who do not identify with a sect and identify as "just a Muslim" make up a majority of the Muslims in these countries: Kazakhstan (74%), Albania (65%), Kyrgyzstan (64%), Kosovo (58%), Indonesia (56%), Mali (55%), Bosnia and Herzegovina (54%), Uzbekistan (54%), and a plurality in four countries: Azerbaijan (45%), Russia (45%), Nigeria (42%), and Cameroon (40%). They are found primarily in Central Asia. Southeastern Europe also has a large number of Muslims who do not identify with a sect. Identification as "just a Muslim" is less prevalent in North Africa (median of 12%) and South Asia (median of 4%). In Lithuania, non-denominational Muslims fall into the category of "non-traditional religious communities", and are formally separated by law from Sunnis.

In folklore, a ghost is the soul or spirit of a dead person or non-human animal that is believed by some people to be able to appear to the living. In ghostlore, descriptions of ghosts vary widely, from an invisible presence to translucent or barely visible wispy shapes to realistic, lifelike forms. The deliberate attempt to contact the spirit of a deceased person is known as necromancy, or in spiritism as a séance. Other terms associated with it are apparition, haunt, haint, phantom, poltergeist, shade, specter, spirit, spook, wraith, demon, and ghoul.

The belief in the existence of an afterlife, as well as manifestations of the spirits of the dead, is widespread, dating back to animism or ancestor worship in pre-literate cultures. Certain religious practices—funeral rites, exorcisms, and some practices of spiritualism and ritual magic—are specifically designed to rest the spirits of the dead. Ghosts are generally described as solitary, human-like essences, though stories of ghostly armies and the ghosts of animals other than humans have also been recounted. They are believed to haunt particular locations, objects, or people they were associated with in life. According to a 2009 study by the Pew Research Center, 18% of Americans say they have seen a ghost.

In sociology, secularization (British English: secularisation) is a multilayered concept that generally denotes "a transition from a religious to a more worldly level." There are many types of secularization and most do not lead to atheism or irreligion, nor are they automatically antithetical to religion. Secularization has different connotations such as implying differentiation of secular from religious domains, the marginalization of religion in those domains, or it may also entail the transformation of religion as a result of its recharacterization (e.g., as a private concern, or as a non-political matter or issue).

The secularization thesis expresses the idea that through the lens of the European enlightenment modernization, rationalization, combined with the ascent of science and technology, religious authority diminishes in all aspects of social life and governance. Pew Research Center notes that economic development is positively correlated with less religiousness. According to Pippa Norris and Ronald Inglehart, "virtually all advanced industrial societies" have become more secular in recent decades.

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 Pew Charitable Trusts is an independent non-profit, non-governmental organization (NGO), founded in 1948.

Pew's stated mission is to serve the public interest by "improving public policy, informing the public, and invigorating civic life". Pew operates projects and conducts research across five main areas: communities, conservation, finance and economy, governing, and health. In addition, the Pew Research Center is a nonpartisan public polling and think tank that operates as a subsidiary of The Pew Charitable Trusts.

Second-generation immigrants in the United States are individuals born and raised in the United States who have at least one foreign-born parent. Although the term is an oxymoron which is often used ambiguously, this definition is cited by major research centers including the United States Census Bureau and the Pew Research Center.

As the Fourteenth Amendment to the United States Constitution guarantees citizenship to any individual born in the U.S. who is also subject to the jurisdiction of the U.S., second-generation Americans are currently granted U.S. citizenship by birth. However, political debate over repealing this right has increased in recent years. Advocates of this motion claim that this right attracts unauthorized immigration to the U.S. The repeal of birthright citizenship would have the greatest impact on second-generation Americans who are Mexican Americans, as Mexico is the country of origin for the majority of undocumented immigrants in the U.S.

Islam in Kosovo has a long-standing tradition dating back to the Ottoman conquest of the Balkans. Before the Battle of Kosovo in 1389, the entire Balkan region had been Christianized by both the Western and Eastern Roman Empire. From 1389 until 1912, Kosovo was officially governed by the Muslim Ottoman Empire and a high level of Islamization occurred among Catholic and Orthodox Albanians, mainly due to Sufi orders and socio-political opportunism. Both Christian and Muslim Albanians intermarried and some lived as "Laramans", also known as Crypto-Christians. During the time period after World War II, Kosovo was ruled by secular socialist authorities in the Socialist Federal Republic of Yugoslavia (SFRY). During that period, Kosovars became increasingly secularized. After the end of the communist period, religion had a revival in Kosovo. Today, 95.6% of Kosovo's population are Sunni Muslims, most of whom are ethnic Albanians. There are also non-Albanian speaking Muslims, who define themselves as Bosniaks, Gorani and Turks.

Islam in Kosovo is predominantly Hanafi Sunni, the most widespread tradition in the Balkans. Additionally, Kosovo has Sufi orders, particularly the Bektashi order, which blends elements of Shia and Sufi traditions. Other Sufi brotherhoods, such as the Halveti and Kadiri orders, also exist. According to a 2012 study by the Pew Research Center, 58% of muslims in Kosovo are non-denominational Muslims, which is practicing Islam without strict adherence to a particular sect or school of thought.