
Catholicism and Evangelicalism are two of the largest Christian denominations in the world. While there is no single structure for Protestant denominations that is comparable to the Catholic Church, several different comparable communions exist within Protestantism, including the World Evangelical Alliance. According to a 2004 Pew survey, Catholics constitute 22% of the US population, while Evangelicals make up 26.3%. Globally, Catholicism is the largest Christian denomination, with an estimated 1.166 billion members in 2008, projected to grow to 1.63 billion in 2050. The Catholic population is particularly prominent in the Americas, constituting 63.10% of the population in this region. On the other hand, Evangelicalism has been experiencing rapid growth in various parts of the world, including China, Iran, and Korea.
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What You'll Learn

Catholic Church's ancient roots
Catholicism is the largest of the three major branches of Christianity, with about 1.3 billion followers out of an estimated 2.5 billion Christians worldwide. It is also the most ancient, tracing its roots to the very beginnings of Christianity.
According to Catholic tradition, the Church began on the day of Pentecost in Jerusalem, with the early Christian community established by the Disciples of Jesus. The Church considers its bishops to be the successors to Jesus's apostles, and the Bishop of Rome, or Pope, to be the sole successor to St. Peter, who was appointed by Jesus as the head of the Church. By the end of the 2nd century, bishops began congregating in regional synods to resolve issues of doctrine and administration.
The Catholic Church became the dominant religion of the Roman Empire in 380, under Emperor Theodosius, and remained so until the fall of the Western Roman Empire. During this time, the Church sponsored great Renaissance artists like Michelangelo and Leonardo da Vinci, who created some of the world's most famous artworks.
The Renaissance also brought a re-examination of accepted beliefs, and conflicts arose between clerics and humanists. The Church's pagan beliefs and practices, such as its views on Mary, have been criticised as being absent from Scripture and more closely resembling the Isis mother-goddess religion of Egypt.
In the United States, Catholic, Evangelical Protestant, and Mainline Protestant are the three largest Christian groups. A 2004 Pew survey found that while 70.4% of Americans identify as Christian, only 22% are Catholic, compared to 26.3% who are Evangelical.
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Evangelicalism in Brazil
Brazil has the world's largest Catholic population, but there has been a surge in evangelicalism in the country. In the 1970s, Brazil was 91% Catholic and 5% Protestant. In 2020, 31% of Brazilians were estimated to be Protestant, with some estimates placing the figure at 15.12%. This shift has been attributed to the efforts of American missionaries, entrepreneurs, and politicians, with evangelical theology promoted as a counter to communism, socialism, and Latin American Catholicism's growing liberation theology.
Evangelicalism was introduced to Brazil by the Scottish missionary Robert Reid Kalley, who founded the first evangelical church among the Portuguese-speaking population in 1856. It was organized as the Igreja Evangélica Fluminense and became the mother church of Congregationalism in Brazil. The Seventh-day Adventists arrived in 1894, and the YMCA was organized in 1896. These missionaries promoted educational institutions, including schools, colleges, and seminaries. By 1914, Protestant churches founded by American missionaries had 47,000 communicants.
The rise of evangelicalism in Brazil has also led to increased religious intolerance toward non-Protestants. Afro-Brazilian religious leaders and institutions have been targeted and destroyed, and an Afro-Brazilian priestess was murdered. As of 2024, evangelicals were labeled as the most intolerant of religious groups in Brazil.
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Religious conversion in Iran
Iran's population is predominantly Muslim, with followers making up 99.4% of the country's 84 million people, according to US government estimates. While the country's post-1979 constitution recognizes Christians as one of only three authorized religious minorities, along with Jews and Zoroastrians, religious conversion is a challenging and dangerous affair for Muslims in Iran.
Muslim converts to other faiths face intimidation and threats not only from their families but also from the Iranian authorities. They are regularly subjected to physical abuse, arbitrary arrests, detention without charges, and even execution. There are an estimated 10,000 Christians from Muslim backgrounds in Iran, and their experiences are similar to those of the Baha'i community, who have faced consistent discrimination, extrajudicial killings, and unexplained disappearances since the Islamic Revolution.
The Iranian government has been known to target Christian converts with harsh treatment, and activists have reported that Tehran continued to do so in the previous year. The government also refuses to recognize the Christianity of converts, only acknowledging Armenian and Assyrian Christians whose presence predates Islam and citizens with proof of pre-1979 Islamic Revolution Christian heritage. This refusal to recognize converts denies them the same rights as recognized members of Christian communities.
The Iranian parliament has also voted in favor of a draft bill that would make apostasy punishable by death for males and life imprisonment for females, further endangering the future of Christian converts and Baha'is in the country.
Despite the challenges, some Iranian Christian converts have received support from Muslim communities. Ebrahim Firoozi, for instance, was treated well and offered housing by the predominantly Sunni Muslim community in Rask during his government-ordered internal exile there.
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US Christian demographics
Christianity is the predominant religion in the United States, though sources disagree on the exact numbers. A 2023 Gallup survey found that about 67% of the US population is Christian, while a 2020 census carried out between 2014 and 2020 showed that 70% of Americans identified as Christian. A 2004 survey identified that 70.4% of Americans call themselves "Christian", with Evangelicals making up 26.3% of the population, Catholics 22%, and mainline Protestants 16%. A 2001 study of the self-described religious identification of the adult population found that 28.6% were Evangelical, 24.5% Catholic, and 13.9% mainline.
Christian denominations in the United States are usually divided into three large groups: two types of Protestantism (Evangelical and Mainline) and Catholicism. There are also smaller groups that do not fall within these categories, such as Eastern and Oriental Orthodoxy, and various restorationist groups including the Latter-Day Saint movement, Adventists, and Jehovah's Witnesses.
In recent years, the overall Christian share of the population has dropped, while the number of Americans who do not identify with any religion has increased. This decline in Christianity is demographically broad-based, with fewer Christians and more "nones" among men and women, people of all racial and ethnic categories, college graduates and those with less education, and residents of all major regions of the country. However, the changes are more pronounced among ideological liberals than conservatives, with 51% of liberals saying they have no religion, up from 27% in 2007.
Within the Protestant traditions, there has been a decline in mainline churches such as the United Methodist Church and the Evangelical Lutheran Church in America, while there has been less change in recent years in the proportion of the population belonging to evangelical or historically black Protestant churches. In 2007, 51% of US Protestants identified with evangelical churches, while in 2020, Evangelicals made up a clear majority (55%) of all US Protestants.
The term "Evangelical" has its roots in the Greek word for "gospel" or "good news", and Protestant theologians embraced the term as referring to "gospel truth". Evangelicalism as a self-conscious movement is difficult to date, but scholars argue that it did not arise until the mid-17th century or perhaps the Great Awakening.
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Religious education in the US
In the United States, religious education takes on a variety of forms and approaches, reflecting the country's diverse religious landscape. While the separation of church and state has sparked debates about the appropriateness of religious instruction in public education, religious education in the US is predominantly private.
Religious Education in Public Schools
In public schools, religious education often focuses on the historical and cultural significance of various religions, promoting understanding and tolerance among students from diverse backgrounds. This approach helps students learn about different faiths and cultivate respect for their peers' beliefs.
Religious Education in Private and Parochial Schools
Private and parochial schools, on the other hand, often integrate religious teachings into their curricula. These schools provide students with a faith-based education that aligns with their beliefs. For example, Catholic schools are known for offering academic excellence alongside spiritual and cultural diversity. Similarly, Islamic schools combine education about the Quran with deep-rooted Muslim traditions.
Sunday School and Youth Programs
Outside of the traditional school system, religious education in the US also takes the form of Sunday school and religious youth programs. Since the nineteenth century, Protestants and Catholics have adopted this approach, which typically involves lessons based on Bible stories. By 1911, over 15 million students were enrolled in Sunday school, demonstrating its popularity.
Higher Education
At the higher education level, the US boasts over 7,000 colleges and universities with religious affiliations, spanning over 50 different faiths. These include institutions founded on Roman Catholic, Jesuit, Presbyterian, Jewish, and Episcopalian principles, among others. International students seeking a unique religious experience often find Catholic, Jewish, and Jesuit schools particularly appealing.
Religious Affiliation and Education
Research has explored the relationship between religious affiliation and education levels in the US. Overall, college graduates tend to be less religious than those with lower educational attainment. However, among Christians, higher education levels do not necessarily lead to lower religiosity. In fact, highly educated Christians are more likely to attend church weekly and exhibit high levels of religiosity, especially among Evangelical Christians (87%) and Black Protestants (89%).
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Frequently asked questions
Catholicism is the largest single denomination, with the Catholic Church claiming 1.3 billion members. The number of Evangelicals is harder to estimate as they are split into various denominations, but they number in the hundreds of millions.
According to a 2004 Pew survey, Evangelicals make up 26.3% of the population, while Catholics make up 22%. However, these numbers may have changed since then.
According to the Chinese government in 2018, there were 38 million Protestants and 6 million Catholics in China. However, it is unclear whether these numbers include Evangelicals, as some sources indicate that Evangelical Christianity is growing quickly in China.











































