The call The "tree of religions" is a visual way of understanding how the world's major beliefs are connected., similar to the concept of tree of Lifewhere they originated and how they have spread across the planet over the centuries. Looking at this spiritual map is almost like putting new glasses on history: suddenly, cultural boundaries, areas of friction, and also vast spaces of mixing and coexistence become clearer.
Today they coexist thousands of different religions, denominations, and spiritual movementsFrom the great monotheistic traditions to indigenous belief systems and Eastern philosophies, nearly all of them revolve around a couple of fundamental questions: how should we live here and now, and what happens when we die? Understanding how these answers are distributed around the world helps us interpret both the past and current geopolitics.
What do we understand by religion and why is it so difficult to talk about them?
When we talk about religion, we are not just referring to "believing in a god," but to a an organized set of beliefs, rituals, values, and symbols that give meaning to existence and connect people to something considered sacred or transcendent. This includes ideas about the origin of the universe, the purpose of life, morality, death, and the possible afterlife.
Religions express themselves in many different ways: sacred texts, places of worship, festivals, moral norms, hierarchies of spiritual leadership (prophets, priests, monks, imams, rabbis, gurus…), as well as a strong symbolic charge visible in the art, architecture, music or founding myths of each people.
Most religious traditions are structured around the belief in one or more forces superior to human beingsWhether it be a single God (as in Christianity, Islam, and Judaism), multiple gods (as in much of Hinduism), or a more abstract ultimate energy. Furthermore, they all draw a boundary between the sacred and the profane and they propose ethical codes, promises of salvation or liberation, and life projects for their followers.
However, when we try to bring order to this forest of beliefs, a problem arises: There is no clear line between “different religion” and “denomination within the same religion”For example, a traditional Mennonite church and a modern Pentecostal community share the Christian root, but their practices, worship style, and worldview are radically different. Even so, they are grouped together as Christianity.
At the opposite extreme, the Sikhism is considered an independent religion today. Despite having been born in an environment deeply marked by Islam and Hinduism in Punjab. Something similar happens with some reformist or syncretic movements which, depending on who is looking at them, are labeled as a new religion, sect, heresy, or internal current of another existing faith.
That's why the most widely accepted estimates speak of between 4.000 and 4.300 religions in the worldBut there is no solid consensus. The figure serves more as an indication of diversity than as a definitive inventory, because it depends heavily on where the line is drawn between religion, philosophy, folk spirituality, or simply local denomination.
A global snapshot of faith: major religious blocs of the planet
If we broaden our perspective and look at the "tree of religions" on a global scale, it becomes clear that a huge portion of humanity is grouped around a few dominant traditions. Even so, Minority branches and local beliefs form an essential part of the religious landscape and they shape cultures, identities and, in many cases, conflicts.
On a global scale, the Christianity tops the list with about 31% of the populationfollowed by a rapidly growing Islam that is now approaching 25%. Behind them are Hinduism, Buddhism, the various traditional religions and those of indigenous peoples, as well as Judaism, which is numerically small but has enormous historical and cultural weight.
Alongside them, there is another key player who alters the map: people without religious affiliationThis group, which includes atheists, agnostics, and those who do not feel part of any organized religion, is very large and is especially present in highly urbanized societies or those with intense processes of secularization.
In total, it is estimated that around 84% of the world's population identifies with a religious groupWhile the rest are divided among the broad spectrum of non-belief or personalized spirituality. The resulting picture doesn't exactly coincide with political borders: if you look at a good map of religions by country, you'll see other blocs of influence that cross states, regions, and continents.
Christianity: the largest branch of the religious tree
Christianity is today the world's largest religion, with some 2.400 billion believersBorn in Judea about two thousand years ago, it soon spread throughout the Roman Empire and, over the centuries, through Europe, America, much of Africa and large areas of Asia and Oceania.
Geographically, the country with the most Christians is The United States, with approximately 253 million faithfulBrazil follows with approximately 185 million, and Mexico with around 118 million. But its influence goes far beyond the simple number of believers: it is deeply embedded in the architecture of cathedrals and monasteriesin Western literature, philosophy and music, and in everyday aspects such as the Gregorian calendar itself.
The calendar that we use almost universally It divides history into "before Christ" and "after Christ"This detail shows the extent to which the Christian worldview was integrated into the Western way of measuring time and ordering the past. It also played a key role in the creation of universities, hospitals and charity networksas well as inspiring social movements such as certain struggles for civil rights.
Over the centuries, Christianity has fragmented into several major branches with distinct doctrines, liturgies, and authority structuresThe largest is Catholicism, headed by the Pope and present mainly in Europe, Latin America, parts of Africa, and the Philippines. The Orthodox Church, widespread especially in Eastern Europe and Russia, separated from Rome in the 11th century and has preserved its own liturgical traditions.
In turn, the Protestantism was born in the 16th century with the Reformation And it diversified into Lutherans, Calvinists, Anglicans, Baptists, Methodists, Pentecostals, and many more. Although they disagree on matters of organization, sacraments, or church authority, all these branches share the core faith in Jesus as the central figure and the Bible as the fundamental reference, which does not prevent internal differences from being as great as those that separate one religion from another.
Islam: the second major religious force and in full expansion
Islam occupies the second position on the world map of religions And it is also the fastest growing faith. Born in the 7th century on the Arabian Peninsula, it spread in just a few centuries from North Africa to Central Asia and South Asia, profoundly transforming the societies it passed through.
Its spread generated a vast Islamic cultural space that left its mark on philosophy, mathematics, medicine, architecture, or poetryCities like Córdoba —with its famous Mosque of Cordoba—, Baghdad, Cairo, Samarkand, and Istanbul were for centuries centers of knowledge and the blending of traditions. In the Middle East, it became the axis of political, social, and legal organization, while in the Maghreb and the African Sahel, it merged with local elements to give rise to unique cultural expressions.
Currently, although Islam is the dominant religion in most countries of the Middle East and North Africa, The largest Muslim populations are concentrated in AsiaIndonesia leads the way, but India also has a huge community: approximately 14,2% of Indians are Muslim, which in absolute terms represents one of the largest Muslim populations on the planet.
From a demographic point of view, Islam is the fastest growing religion: it is estimated that Its population will increase from about 1.800 billion in 2015 to almost 3.000 billion in 2060., an increase of around 70%. Part of this surge is explained by the fact that the Muslim population has a very low average age, close to 24 yearsThis implies high birth rates and a large proportion of young people and children in the total.
Internally, Islam is also far from monolithic. The branch Sunni is the majority and is guided by the Sunnah of the Prophet, developing four major schools of law. The second major family is the Shiism, centered on the line of imams descended from the Prophetwhich in turn is subdivided into several currents such as the Twelvers or the Ismailis. Added to this are Sufism, with its mystical emphasis, Kharijite, Ibadism, and other more recent movements, which respond to both theological debates and political and social changes.
People without religion: atheists, agnostics, and unaffiliated people
There is also a peculiar branch in the “tree of religions”: the group made up of those who do not adhere to any organized religionWhether they identify as atheists, agnostics, or simply "non-religious," this group has grown significantly, especially in urban environments, societies with strong secular traditions, or countries with a history of anti-religious policies.
In several East Asian states this phenomenon is very evident. In China, hundreds of millions of people consider themselves unaffiliated.Some estimates suggest that around 720 million Chinese do not belong to any particular religion. However, this does not always mean a total absence of beliefs: among unaffiliated Chinese adults, around 7% claim to have found faith in God or some kind of higher powerThis demonstrates that the boundary between organized religion and personal spirituality is not always clear.
Other countries in the region show similar patterns. In In Japan, a significant portion of the population identifies as non-religious in their daily lives.Although they participate in Shinto or Buddhist rituals linked to family traditions or cultural festivities. Something similar is happening in South Korea, where rapid economic development and urbanization have gone hand in hand with greater secularization, especially among young people.
En North Korean authorities have systematically repressed traditional religionsinstead promoting the state ideology of Juche, while in Taiwan, a more open and pluralistic society combines traditional beliefs with a growing secular perspective. All of this leads some analyses to refer to non-believers as the “third major force” on the world religious map, although From a strictly atheist point of view, atheism and agnosticism are not religions..
Outside of Asia, secularization is also strong in several European countries. A striking example is Czech Republic, where 78% of the population claims not to identify with any religionIn France or the United States, surveys show that a considerable portion of the unaffiliated still maintain some kind of belief in God, universal energy, or various forms of spirituality.
Hinduism: the third largest religion on the planet
Hinduism is, after Christianity and Islam, the third largest religion in the world, with around 1.200 billion followersIt was born and developed in the Indian subcontinent, and unlike other traditions it does not have a single founder or a clear date of origin: it is rather the result of a long evolution of beliefs, texts and rituals.
The curious thing is that, despite its size, Hinduism It is the majority religion in only a few countriesIndia (where approximately 79% of the population identifies as Hindu), Nepal (around 80%), and Mauritius (around 48%). In many other places, they appear as a significant minority, the result of historical migrations and population movements during colonial and post-colonial periods.
Beyond their base in South Asia, there are significant Hindu communities in the Caribbean, Southeast Asia, North America and South AmericaThis has led to a much more globalized cultural influence in recent decades. Practices such as yoga, certain festivals, and elements of their worldview and Hindu art They have strongly penetrated secular spaces around the world.
At a doctrinal level, Hinduism is extremely diverse, but many of its currents recognize or venerate deities such as Vishnu, Shiva, Ganesha, Shakti or SuryaEven so, many Hindu schools understand all these figures as manifestations of a single ultimate reality, which complicates categorizing it within the simple categories of "polytheistic" or "monotheistic" used in the West. Many of these elements are reflected in the Hindu symbols that identify traditions and practices.
Buddhism: Identity, Practice, and Asian Geography
Buddhism, which also originated in South Asia, has today some hundreds of millions of practitioners spread mainly across East Asia and Southeast AsiaGlobally, there are approximately 535 million followers, although this figure is difficult to pinpoint because in many countries it is mixed with other religious traditions.
Estimates indicate that approximately Half of all Buddhists in the world live in ChinaHowever, within the Chinese population they represent only around 18%, reflecting the prevalence of other belief systems (Confucianism, Taoism, folk religions) and religious affiliation. The remaining Buddhists are concentrated mainly in East and South Asia.
A very significant case is that of Thailand, where approximately 93% of the population considers themselves BuddhistEven so, the way religion is experienced varies enormously: for some people it is an intensive practice with a strong connection to monasteries, while for others it consists of participating in specific festivities and rituals linked to national identity.
Academics have long pointed out that In many Asian countries, one can follow Buddhist customs without feeling part of an "organized religion."Many people go to temples, offer incense, or respect the moral teachings of Buddha, but when responding to surveys about religion, they define themselves as "non-religious" or as practitioners of another dominant tradition.
That mixture of Cultural identity and religious practice make Buddhism difficult to quantify.Even so, its impact on philosophy, meditation, the visual arts, and the way millions of people understand suffering, desire, and the path to liberation is undeniable.
Traditional religions, folk cults and vernacular beliefs
Beyond the five major religious families, the planet is full of popular beliefs, ethnic spiritual systems, and traditional religions that don't quite fit the label of "organized religion". They are practices that are lived primarily in the local and everyday sphere, often without centralized institutions or a single sacred text.
This set is usually called “vernacular” or “popular” religionIt is the way in which people integrate the sacred into their daily lives by mixing official influences with ancestral customs, family rituals, ancestor worship, respect for nature spirits, or beliefs in invisible forces that protect or punish.
According to recent calculations, by 2020 there had been some 429 million people —approximately 6% of the world's population— following traditional religionsMany of these practices are present in African societies, Chinese communities, Native American peoples, and Australian Aboriginal groupsalthough they are not lacking in other parts of the world either.
In many cases, these religions are combined with the majority religions: someone may attend mass or declare themselves Muslim and, at the same time, respect the ancestral rites of their people. This syncretism makes the real religious map much more diverse than the statistics suggest, reflecting a superimposition of spiritual layers ranging from indigenous cosmologies to global doctrines.
Judaism: a minority faith with enormous historical weight
In terms of the number of followers, Judaism is one of the smaller branches of the great world religious tree: Approximately 0,2% of the population identifies as JewishHowever, its historical, cultural, and political influence is disproportionately large in relation to its population size.
For many centuries, Jewish communities existed throughout Europe, North Africa, the Middle East, and other regions. Today, however, the Jewish population is concentrated very markedly in just two countries: the United States and IsraelMore than four-fifths of the world's Jews live there.
Israel is also the only state with a Jewish majorityAround 76% of its inhabitants identify as practicing or cultural Jews. Following that, the largest communities in relative terms are found in Canada (around 3% of the population), France, the United Kingdom, Germany, and Russia (around 2% each), as well as Argentina, where the percentage is between 1% and 2%.
Although their numbers are small, Judaism has left a decisive mark on The formation of Christianity and Islam, in the biblical tradition, in Western ethics, and in contemporary political debatesIts texts, figures, and symbols, such as the David's starThey run through much of the history of the West and remain key to understanding the geopolitics of the Middle East.
How religion has spread around the world: maps, animations, and invisible borders
If we could see an animation of the last millennia, we would observe how Religions are born in relatively close areas and then spread like splashes of color that overlap, blend, or clash with one another. Christianity, Islam, and Judaism arose in a relatively narrow strip of the Near East; Hinduism and Buddhism in the area of the Indian subcontinent and neighboring regions.
Over time, the Judaism was reduced to Israel and communities scattered throughout the worldMeanwhile, Christianity and Islam, with their multiple internal branches, conquered enormous spaces: America, much of Europe and regions of Africa and Asia in the Christian case; a wide strip from Morocco to Pakistan and Indonesia in the Muslim case.
Although there is no particular spiritual fervor everywhere today, the geographical distribution of faith continues to be marked very clear borders between cultural blocsThe line separating the north and south of the Mediterranean, Turkey's complex position, the tensions in the Caucasus, or the Kashmir region are clear examples of how religions and geopolitics are intertwined.
Various visual projects, such as interactive maps and time-series graphics created from data from Pew Research Center or specific demographic studies, and references to archaeological discoveriesThese studies allow us to appreciate how the religious proportions of each country have changed over the last 50 years. They reveal, for example, the advance of Islam in certain areas of Africa and Asia, the relative Christian homogenization of some Western countries, and the great internal diversity of Asia and Oceania.
These maps demonstrate the extent to which the Religious power and political power overlap. in many territories, influencing social norms, legal systems, internal conflicts, and international relations. Looking at this “tree of religions” on a map is, ultimately, a very useful way to understand who's who on the global stage.
Spain on the world religious map
If we narrow our focus and look at Spain within this larger picture, we find a country where Around 84% of the population considers themselves believersHowever, the specific way in which this belief is lived varies greatly. The vast majority of those who identify as religious are associated with Christianity, and more specifically with Catholicism.
It is estimated that Around 80,56% of the inhabitants identify with ChristianityHowever, this doesn't mean everyone practices in the same way: according to CIS data, about two-thirds of Spaniards identify as Catholic, but only a minority—around 22,7%—claim to attend Mass or go to confession regularly. In other words, Catholic cultural identity is much broader than strictly religious practice.
On the other hand, the group of Atheists, agnostics, and people who do not consider themselves believers now outnumber practicing Catholics., standing at around 29%. This fits with a general trend in Western Europe, where secularization coexists with the persistence of religious symbols and traditions deeply rooted in the festive calendar and social life.
Regarding other confessions, Only about 2,3% of the population claims to belong to religions other than Catholicism.Although in absolute terms this already represents hundreds of thousands of people. This includes Protestant, Muslim, Orthodox, Jehovah's Witness, Buddhist, Jewish communities, and many other minorities that are slowly reshaping the religious landscape of Spain.
Seen from the outside, the Spanish case illustrates well how Religion, culture, and national identity can remain linked even when intense religious practice declines.The processions, the patron saint festivals, and the official holiday calendar itself demonstrate the historical weight of Christianity, while new minorities and non-believers add layers of diversity to the landscape.
Viewing the “tree of religions” on a global scale allows us to better understand why such distant areas share common spiritual roots and how Beliefs continue to draw boundaries of influence and cultural blocs beyond political lines.From the 2.400 billion Christians to the few million Jews, passing through the burgeoning Islam, the 1.200 billion Hindus, the Buddhist mosaic, the hundreds of millions of practitioners of traditional religions and the growing weight of atheists and unaffiliated people, the religious map of the world It remains one of the fundamental keys to interpreting contemporary history, society, and geopolitics.
