Protestantism in the context of Jean Bauhin

Jewish Christians were the followers of a Jewish religious sect that emerged in Roman Judea during the late Second Temple period, under the Herodian tetrarchy (1st century AD). These Jews believed that Jesus was the prophesied Messiah and they continued their adherence to Jewish law. Jewish Christianity is the historical foundation of Early Christianity, which later developed into Nicene Christianity (which comprises the Roman Catholic, Eastern Orthodox, Oriental Orthodox, and Protestant traditions) and other Christian denominations.

Christianity started with Jewish eschatological expectations, and it developed into the worship of Jesus as the result of his earthly ministry in Galilee and Jerusalem, his crucifixion, and the post-resurrection experiences of his followers. Jewish Christians drifted apart from Second Temple Judaism, and their form of Judaism eventually became a minority strand within mainstream Judaism, as it had almost disappeared by the 5th century AD. Jewish–Christian gospels are lost except for fragments, so there is a considerable amount of uncertainty about the scriptures which were used by this group of Christians.

A state religion (also called official religion) is a religion or creed officially endorsed by a sovereign state. A state with an official religion (also known as a confessional state), while not a secular state, is not necessarily a theocracy. State religions are subject to advantageous treatment by official or government-sanctioned establishments of them, ranging from incentivising citizens to recognise and practice them through government endorsement to having public spending on the maintenance of religious property and clergy be unrestricted, but the state does not need to be under the legislative control of the clergy as it would be in a theocracy. Generally, these religions have more rights and fewer restrictions in the country than other religions in a country.

Official religions have been known throughout human history in almost all types of cultures, reaching into the Ancient Near East and prehistory. The relation of religious cult and the state was discussed by the ancient Latin scholar Marcus Terentius Varro, under the term of theologia civilis (lit. 'civic theology'). The first state-sponsored Christian denomination was the Armenian Apostolic Church, established in 301 CE. In Christianity, as the term church is typically applied to a place of worship for Christians or organizations incorporating such ones, the term state church is associated with Christianity as sanctioned by the government, historically the state church of the Roman Empire in the last centuries of the Empire's existence, and is sometimes used to denote a specific modern national branch of Christianity. Closely related to state churches are ecclesiae, which are similar but carry a more minor connotation.

Eastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or "canonical") Eastern Orthodox Church is organised into autocephalous churches independent from each other. In the 21st century, the number of mainstream autocephalous churches is seventeen; there also exist autocephalous churches unrecognized by those mainstream ones. Autocephalous churches choose their own primate. Autocephalous churches can have jurisdiction (authority) over other churches, some of which have the status of "autonomous" which means they have more autonomy than simple eparchies.

Many of these jurisdictions correspond to the territories of one or more modern states; the Patriarchate of Moscow, for example, corresponds to Russia and some of the other post-Soviet states. They can also include metropolises, bishoprics, parishes, monasteries, or outlying metochia corresponding to diasporas that can also be located outside the country where the primate resides (e.g., the case of the Ecumenical Patriarchate of Constantinople whose canonical territory is located partly in northern Greece and the east); sometimes they overlap (the case of Moldova where the jurisdictions of the patriarchs of Bucharest and of Moscow overlap).

Mary was a first-century Jewish woman of Nazareth, the wife of Joseph and the mother of Jesus. She is an important figure of Christianity, venerated under various titles such as virgin or queen, many of them mentioned in the Litany of Loreto. The Eastern and Oriental Orthodox, Catholic, Evangelical Lutheran, Reformed, Anglican, Methodist and Baptist churches believe that Mary, as mother of Jesus, is the Mother of God. The Church of the East historically regarded her as Christotokos, a term still used in Assyrian Church of the East liturgy. She has the highest position in Islam among all women and is mentioned numerous times in the Quran, including in a chapter named after her. She is also revered in the Baháʼí Faith and the Druze Faith.

The synoptic Gospels name Mary as the mother of Jesus. The gospels of Matthew and Luke describe Mary as a virgin who was chosen by God to conceive Jesus through the Holy Spirit. After giving birth to Jesus in Bethlehem, she and her husband Joseph raised him in the city of Nazareth in Galilee, and she was in Jerusalem at his crucifixion and with the apostles after his ascension. Although her later life is not accounted in the Bible; Catholic, Eastern Orthodox, and some Protestant traditions believe that her body was raised into heaven at the end of her earthly life, which is known in Western Christianity as the Assumption of Mary and in Eastern Christianity as the Dormition of the Mother of God.

The Czech Republic, also known as Czechia and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The Czech Republic has a hilly landscape that covers an area of 78,871 square kilometers (30,452 sq mi) with a mostly temperate continental and oceanic climate. The capital and largest city is Prague; other major cities and urban areas include Brno, Ostrava, Plzeň and Liberec.

The Duchy of Bohemia was founded in the late 9th century under Great Moravia. It was formally recognized as an Imperial Estate of the Holy Roman Empire in 1002 and became a kingdom in 1198. Following the Battle of Mohács in 1526, all of the Lands of the Bohemian Crown were gradually integrated into the Habsburg monarchy. Nearly a hundred years later, the Protestant Bohemian Revolt led to the Thirty Years' War. After the Battle of White Mountain, the Habsburgs consolidated their rule. With the dissolution of the Holy Roman Empire in 1806, the Crown lands became part of the Austrian Empire.

The modern era or the modern period is considered the current historical period of human history. It was originally applied to the history of Europe and Western history for events that came after the Classical antiquity and the Middle Ages, often from around the year 1500, like the Reformation in Germany giving rise to Protestantism. Since the 1990s, it has been more common among historians to refer to the period after the Middle Ages and up to the 19th century as the early modern period. The modern period is today more often used for events from the 19th century until today. The time from the end of World War II (1945) can also be described as being part of contemporary history. The common definition of the modern period today is often associated with events like the French Revolution, the Industrial Revolution, and the transition from nationalism toward the liberal international order.

The modern period has been a period of significant development in the fields of science, politics, warfare, and technology. It has also been an Age of Discovery and globalization. During this time, the European powers and later their colonies, strengthened their political, economic, and cultural colonization of the rest of the world. It also created a new modern lifestyle and has permanently changed the way people around the world live.

Christendom or the Christian world are terms commonly used to refer to the global Christian community, Christian states, Christian-majority countries or countries in which Christianity is dominant or prevails.

Following the spread of Christianity from the Levant to Europe and North Africa during the early Roman Empire, Christendom has been divided in the pre-existing Greek East and Latin West. After the Great schism of 1054, two main branches within Christianity emerged, centred around the cities of Rome (Western Christianity, whose community was called Western or Latin Christendom) and Constantinople (Eastern Christianity, whose community was called Eastern Christendom or Byzantine commonwealth). After the fall of Constantinople in 1453, Latin Christendom rose to a central role in the Western world. Following the reformation, protestantism emerged as the third main branch of Christianity in the 16th century. The history of the Christian world spans about 2,000 years and includes a variety of socio-political developments, as well as advancements in the arts, architecture, literature, science, philosophy, politics and technology.

Western Christianity is one of two subdivisions of Christianity (Eastern Christianity being the other). Western Christianity is composed of the Latin Church and Western Protestantism, together with their offshoots such as the Old Catholic Church, Independent Catholicism and Restorationism.

The large majority of the world's 2.3 billion Christians are Western Christians (about 2 billion: 1.3 billion Latin Catholic and 1.17 billion Protestant). One major component, the Latin Church, developed under the bishop of Rome. Out of the Latin Church emerged a wide variety of independent Protestant denominations, including Lutheranism and Anglicanism, starting from the Protestant Reformation in the 16th century, as did Independent Catholicism in the 19th century. Thus, the term "Western Christianity" does not describe a single communion or religious denomination but is applied to distinguish all these denominations collectively from Eastern Christianity.

The early modern period is a historical period, with divisions based primarily on the history of Europe and the broader concept of modernity. There is no exact date that marks the beginning or end of the period and its extent may vary depending on the area of history being studied. In general, the early modern period is considered to have started at the beginning of the 16th century, and is variably considered to have ended at the 18th or 19th century (around 1500 to 1700–1800). In a European context, it is defined as the period following the Middle Ages and preceding the advent of modernity, but there is no universal agreement on the dates of these boundaries. In the context of global history, the early modern period is often used even in contexts where there is no equivalent "medieval" period.

Various events and historical transitions have been proposed as the start of the early modern period, including the fall of Constantinople in 1453, the start of the Renaissance, the end of the Crusades, the Reformation in Germany giving rise to Protestantism, and the beginning of the Age of Discovery and with it the onset of the first wave of European colonization. Its end is often marked by the French Revolution, and sometimes also the American Revolution or Napoleon's rise to power, with the advent of the second wave modern colonization of New Imperialism.

Francis I (French: François I; Middle French: Françoys; 12 September 1494 – 31 March 1547) was King of France from 1515 until his death in 1547. He was the son of Charles, Count of Angoulême, and Louise of Savoy. He succeeded his first cousin once removed and father-in-law Louis XII, who died without a legitimate son.

A prodigious patron of the arts, Francis promoted the emergent French Renaissance by attracting many Italian artists to work for him, including Leonardo da Vinci, who brought the Mona Lisa, which Francis had acquired. Francis's reign saw important cultural changes with the growth of central power in France, the spread of humanism and Protestantism, and the beginning of French exploration of the New World. Jacques Cartier and others claimed lands in the Americas for France and paved the way for the expansion of the first French colonial empire.

Christianity has been the largest religion in Ireland since the 5th century. After a pagan past of Antiquity, missionaries (most famously including Saint Patrick) converted the Irish tribes to Christianity in quick order. This produced a great number of saints in the Early Middle Ages, as well as a faith interwoven with Irish identity for centuries since − though less so in recent times.

Most Christian churches are organized on an "all-Ireland" basis, including both the Republic of Ireland and Northern Ireland. In the 2022 census, 76.1% of residents in the Republic of Ireland identified as Christians: 69.1% as Catholics, 4.2% as Protestants, 2.1% as Orthodox Christians and 0.7% as other Christians. In the 2021 Northern Irish census, 79.7% of residents identified as Christians: 42.3% as Catholics, 16.6% as Prebysterian, 11.5% as Church of Ireland members, 2.4% as Methodist and 6.9% as other Christians. Orthodoxy has been the fastest growing branch of Christianity in Ireland since 1991.

Christianity is the predominant religion in Serbia. The Constitution of Serbia defines it as a secular state with guaranteed religious freedom. Eastern Orthodox Christians with 6,079,396 members, comprise 84.5% of country's population. The Serbian Orthodox Church is the largest and traditional church of the country; adherents of it are overwhelmingly Serbs. Public schools in Serbia allow religious teaching, most commonly with the Serbian Orthodox Church. Serbian public holidays include the religious celebrations of Eastern Orthodox Christians. Other Orthodox Christian communities in Serbia include Montenegrins, Romanians, Macedonians, and Bulgarians. The Catholic Church is prominent in north Vojvodina amongst the Hungarian minority. Protestantism is most largely found in Slovak populations within Bački Petrovac and Kovačica. Christianity first arrived in Serbia in the 9th century. It became state-religion in the 9th century when Serbia began to identify as a Christian country. In a 2011 census, 91.22% of Serbians identified as Christian.

Finland is a predominantly Christian nation where 62.2 % of the Finnish population of 5.6 million are members of the Evangelical Lutheran Church of Finland (Protestant), 34.9 % are unaffiliated, 1.0% are Orthodox Christians, and 1.8 % follow other religions. These statistics do not include, for example, asylum seekers who have not been granted a permanent residence permit.

There are two national churches, the Evangelical Lutheran Church of Finland (Protestant) and the Finnish Orthodox Church.Those who officially belong to one of the two national churches have part of their taxes turned over to their respective church (approximately 1-2% of income).

Religion in Austria is predominantly Christianity, adhered to by 68.2% of the country's population according to the 2021 national survey conducted by Statistics Austria. Among Christians, 80.9% were Catholics, 7.2% were Orthodox Christians (mostly belonging to the Eastern Orthodox Church), 5.6% were Protestants, while the remaining 6.2% were other Christians, belonging to other denominations of the religion or not affiliated to any denomination. In the same census, 8.3% of the Austrians declared that their religion was Islam, 1.2% declared to believe in other non-Christian religions (including Buddhism, Hindusim, Judaism and others), and 22.4% declared they did not belong to any religion, denomination or religious community.

Religion in Bulgaria has been dominated by Christianity since its adoption as the state religion in 864. The dominant form of the religion is Eastern Orthodox Christianity within the fold of the Bulgarian Orthodox Church. During the Ottoman rule of the Balkans, Islam spread to the territories of Bulgaria, and it remains a significant minority today. The Catholic Church has roots in the country since the Middle Ages, and Protestantism arrived in the 19th century; both of them remain very small minorities. Today, a significant part of the Bulgarians are not religious, or believers who do not identify with any specific religion, and Bulgaria has been the cradle of some new religions, notably the Neo-Theosophical movement of Dunovism.

Christianity in Italy has been historically characterised by the dominance of the Catholic Church since the East–West Schism. However, the country is also home to significant Christian minorities, especially Orthodox Christians, Protestants and Jehovah's Witnesses.

The country's patron saints are Francis of Assisi and Catherine of Siena.

Religion in Slovakia is predominantly Christianity, adhered to by about 68.8% of the population in 2021.

The Catholic Church is the major Christian tradition in the country, followed in 2021 by 59.8% of the population, a majority of whom (55.8%) were of the Latin Church and a minority of whom (4%) were of the Slovak Greek Catholic Church. About 9% of the population were mostly followers of Protestantism, and a minority of Eastern Orthodox Church and other Christian denominations; the major groupings are the Evangelical Church of the Augsburg Confession in Slovakia (5.3%), the Reformed Christian Church in Slovakia (1.6%), the Orthodox Church of the Czech Lands and Slovakia (0.9%), the Jehovah's Witnesses (0.3%), and other smaller Christian denominations (0.9%). In 2021, about 23.8% of the population declared themselves not religious, an increase from 13.4% in 2011. An additional 1.2% of the population were followers of other religions or beliefs; small religious minorities in Slovakia include Buddhism, modern Paganism, Islam, Judaism, Jediism, Hinduism

Religion in Switzerland is predominantly Christianity. According to the national survey of the Swiss Federal Statistical Office, in 2023, Christians accounted for 56% of the resident population (aged fifteen years and older), of whom 30.7% were Catholics, 19.5% were Swiss Protestants, and 5.8% were followers of other Christian denominations (about half Orthodox and half other Protestants). The proportion of Christians has declined significantly since 1980, when they constituted about 94% of the population; during the same timespan, unaffiliated Swiss residents have grown from about 4% to 31% of the population, and people professing non-Christian religions have grown from about 1% to 7.2% of the population. In 2020, according to church registers, 35.2% of the resident population were registered members of the country's Catholic Church, while 23.3% were registered members of the Protestant Church of Switzerland.

Christianity in Russia is the most widely professed religion in the country. The largest tradition is the Russian Orthodox Church. According to official sources, there are 170 eparchies of the Russian Orthodox Church, 145 of which are grouped in metropolitanates. There are from 500,000 to one million Old Believers, who represent an older form of Russian Orthodox Christianity, and who separated from the Orthodox Church in the 17th century as a protest against Patriarch Nikon's church reforms.

The Catholic Church estimates that there are from 600,000 to 1.5 million Catholics in the country, exceeding government estimates of about 140,000. There is one Catholic Archdiocese, Mother of God at Moscow, with three suffragan dioceses (Saint Clement at Saratov, Saint Joseph at Irkutsk, Transfiguration at Novosibirsk) and the Apostolic Prefecture of Yuzhno-Sakhalinsk. According to the Slavic Center for Law and Justice, Protestants make up the second or third largest group of Christians in Russia, with approximately 3,500 organizations and more than 1 million followers. A large number of missionaries operating in the country are from Protestant denominations.