Религиозный ландшафт Бельгии: тенденции и свобода вероисповедания.

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Christianity is the largest religion in Belgium, with the Catholic Church representing the largest community, though it has experienced a significant decline since the 1950s (when it was the nominal religion of over 80% of the population). Belgium's policy separates the state from the churches, and freedom of religion of the citizens is guaranteed by the country's constitution. According to the Eurobarometer poll carried out by the European Commission in 2021, the share of Christians was 49%, with Catholicism being the largest denomination at 44%. Protestants and other Christians comprised 4% and Orthodox Christians comprised 1%. Non religious people comprised 41% of the population and were divided between those who primarily identified as atheists (15%) or as agnostics (26%). A further 2% of the population was Muslim, with the remainder belonging to other religious or unspecified groups.

The Belgian constitution provides for freedom of religion, and the government generally respects this right in practice. However, government officials have the authority to research and monitor religious groups that are not officially recognised. There are a few reports of societal abuses or discrimination based on religious belief or practice, and some reports of discrimination against minority religious groups. Belgian law officially recognizes many religions, including Catholicism, Protestantism, Anglicanism, Islam, Judaism, and Eastern Orthodoxy, as well as non religious philosophical organizations (Dutch: vrijzinnige levensbeschouwelijke organisaties; French: organizations laïques). Buddhism is in the process of being recognized under the secular organization standard. Official recognition means that priests (called "counselors" within the secular organizations) receive a state stipend. Also, parents can choose any recognized denomination to provide religious education to their children if they attend a state school. Adherents to religions that are not officially recognized are not denied the right to practice their religion but do not receive state stipends. After attaining autonomy from the federal government in religious matters, the Flemish Parliament passed a regional decree installing democratically elected church councils for all recognised religious denominations and making them subject to the same administrative rules as local government bodies, with important repercussions for financial accounting and open government. In 2006, however, Catholic bishops still appointed candidates to the Catholic Church councils because they had not decided on the criteria for eligibility; they were afraid that candidates might be merely baptized Catholics. By 2008, however, the bishops decided that candidates for the church councils had only to prove that they were over 18, a member of the parish church serving the town or village in which they lived, and baptized Catholic. In 2022, the country was scored 3 out of 4 for religious freedom.

Catholicism has traditionally been Belgium's majority religion, with particular strength in Flanders. However, by 2009, Sunday church attendance was 5.4% in Flanders, down from 12.7% in 1998. Nationwide, Sunday church attendance was 5% in 2009, down from 11.2% in 1998. As of 2015, 52.9% Belgian population claimed to belong to the Catholic Church. for the Flanders region. Since 2000, Sunday church attendance in Flanders has dropped by an average of 0.5%–1% each year. In the years 2010 to 2016, 12,442 people in Flanders formally left the Catholic Church. The “Catholic Church in Belgium 2023” report said that 50% of Belgium’s population identified as Catholic in 2022 down from 53% in 2017 with 8.9% attending Mass at least once a month.

In 1566, at the peak of Belgian Reformation, there were an estimated 300,000 Protestants, or 20% of the Belgian population. The Spanish reconquest of the Southern Netherlands in the Eighty Years' War prompted most of the Belgian Protestants to flee to the north or convert, causing the region to again be overwhelmingly Catholic. As of 2017, Protestantism represented 4% of the total population, according to Pew Research. The Administrative Council of Protestant and Evangelical Religion in Belgium is a coordinating group that mediates between many Protestant groups and the government. The largest Protestant denomination is the United Protestant Church in Belgium, with some 138 affiliated churches. including the pro cathedral, Holy Trinity, Brussels. They are part of the Church of England's Diocese in Europe, and of the Convocation of Episcopal Churches in Europe.

Eastern Orthodox Christians made up 1.6% of the total Belgian population in 2015. Ipsos' survey in 2016 found that Orthodox Christianity was the religion of about 1% of the working age, internet connected Belgians.

There is a small but long standing Jewish community concentrated in Antwerp.

Eurobarometer 2015 found only 0.2% of the total Belgian population declaring to be Buddhist.

According to Ipsos, 1% of the working age, internet connected Belgians declared that they believed in Confucianism. this increased to 7,901 Hindus in 2015 and 10,000 in 2020. The majority of Hindus in Belgium originate from Nepal, some come from diamond trading communities in India, and some are native converts, mostly of the ISKON movement.

Antoinism is a Christian inspired new religious movement which was created by Louis Joseph Antoine (1846–1912). It remains the only significant such movement to originate in Belgium and has adherents in France and elsewhere.

Jainism is a Dharmic religion from India which has around 2,000 adherents in Belgium (as of 2020), consisting mainly of Indian migrants who specialize in the diamond trade within Antwerp. The Shankheswar Parshvanath Jain temple, which is located in the Antwerpian municipality of Wilrijk, remains the only Jain temple within continental Europe.

After the Roman period, Christianity was brought back to the southern Low Countries by missionary saints like Willibrord and Amandus. In the 7th century, abbeys were founded in remote places, and it was mainly from these abbeys that the Christianization process was started. This process was expanded under the auspices of the Merovingian dynasty, and later by Charlemagne, who even waged war to impose the new religion.

From the Spanish military conquest of 1592 until the re establishment of religious freedom in 1781 by the Patent of Toleration under Joseph II of Austria, Catholicism was the only religion allowed, on penalty of death, in the territories now forming Belgium. However, a small number of Protestant groups managed to survive at Maria Horebeke, Dour, Tournai, Eupen, and Hodimont.

Religion was one of the differences between the almost solidly Catholic south and the predominantly Protestant north of the United Kingdom of the Netherlands, formed in 1815. The union broke up in 1830 when the south seceded to form the Kingdom of Belgium. In Belgium's first century, Catholicism was such a binding factor socially that it prevailed over the language divide (Dutch versus French). The decline in religion's importance as a social marker across late 20th century Western Europe explains to a large extent the current centrifugal forces in Belgium, with language differences (increasingly reinforced by a positive feedback effect in the media) no longer being kept in check by a religious binding factor. If anything, the Catholic Church has acquiesced to these changes by having a Dutch speaking university (Katholieke Universiteit Leuven) and a French speaking university (Universite Catholique de Louvain). Until the late 20th century, Catholicism played an important role in Belgian politics. One significant example was the so called Schools' Wars (Dutch: schoolstrijd; French: guerres scolaires) between the country's philosophically left wing parties (liberals at first, joined by Socialists later) and the Catholic party (later the Christian Democrats), which took place from 1879 to 1884 and from 1954 to 1958. Another important controversy happened in 1990, when the Catholic monarch, King Baudouin I, refused to ratify an abortion bill that had been approved by Parliament. The king asked Prime Minister Wilfried Martens and his government to find a solution, which proved novel. The government declared King Baudouin unfit to fulfill his constitutional duties as monarch for one day. Government ministers signed the bill in his place and then proceeded to reinstate the king after the abortion law had come into effect.

In 2002, the officially recognized Protestant denomination at the time, the United Protestant Church of Belgium (consisting of around 100 member churches, usually with a Calvinist or Methodist past) and the unsubsidized Federal Synod of Protestant and Evangelical Churches (which had 600 member churches in 2008 but did not include all Evangelical and Charismatic groups outside the Catholic tradition) together formed the Administrative Council of the Protestant and Evangelical Religion (ARPEE in Dutch, CACPE in French). The council is now the accepted mouthpiece of Protestantism in all three linguistic communities of Belgium: Dutch, French, and German. The 21st century has witnessed significant changes in the religious demography of Belgium, characterized by a decline of Catholicism and the growth of irreligion and other religions, some of them brought by waves of immigration from foreign countries, including Pentecostalism, Orthodox Christianity, Islam, Hinduism, Buddhism and Chinese religions. Apart from Islam, however, these groups are very small demographically, especially alongside the unaffiliated demographic of 37%.