In the US, Protestantism is generally divided between mainline denominations and evangelical or theologically conservative denominations. In other parts of the world, the term mainline Protestant is not used. Instead, the term "ecumenical" is used to distinguish similar churches from evangelical denominations. Some have criticized the term mainline for its alleged White Anglo-Saxon Protestant ethnocentric and elitist assumptions, and its erroneous association with the term "mainstream" since it almost exclusively described White American, non-fundamentalist and non-evangelical Protestant Americans from its origin to the late twentieth century.
The largest mainline churches are sometimes referred to as the "Seven Sisters of American Protestantism," a term apparently coined by William Hutchison. The "Seven Sisters" are:
The term 'mainline' has also been applied to Canadian Protestant churches that share common origins with their US counterparts such as the:
These same sources also consider "Mainline" other denominations outside the US, including:
Historically African American denominations are usually categorized differently from evangelicals or mainline. However, in 2014 the Christian Century identified that these groups "fit the mainline description."
In practice, mainline churches tend to be theologically moderate and influenced by higher criticism, an approach used by scholars to separate the Bible's earliest historical elements from perceived later additions and intentional distortions. Mainline denominations generally teach that the Bible is God's Word in function, but that it must be interpreted both through the lens of the cultures in which it was originally written, and examined using God-given reason. A 2008 survey conducted by the Pew Research Center found that 22 percent of the 7,500 mainline Christians surveyed said the Bible is God's Word and is to be interpreted as literally true, word for word. Thirty-eight percent thought that the Bible is God's Word but is not to be taken literally, word for word. Twenty-eight percent said the Bible was not the Word of God but was of human origin.
The mainline denominations emphasize the biblical concept of justice, stressing the need for Christians to work for social justice, which usually involve politically liberal approaches to social and economic problems. Early in the 20th century, they actively supported the Social Gospel.
Many mainline denominations are active in voicing perspectives on social issues. Almost all mainline denominations are gender-inclusive and ordain women.
Politically, mainline churches are also active. While no particular candidate can be endorsed, mainline churches often invite political speakers. At the 2016 General Conference for the African Methodist Episcopal Church, a historically Black denomination which also identifies as mainline, Hillary Clinton was invited to offer an address for the delegates and clergy.
The Episcopal Church (TEC), Presbyterian Church (USA) (PCUSA), Unitarian Universalist Association (UUA), and United Church of Christ (UCC) are members of the Religious Coalition for Reproductive Choice. The United Methodist Church (UMC) and Evangelical Lutheran Church in America (ELCA) support exceptions, when abortion may be necessary, but do not endorse the procedure. Other denominations, such as the Church of the Brethren and Mennonite Church USA, are against abortion.
Many mainline churches recognize, bless and/or perform same-sex marriages, including the ELCA, TEC, PC(USA), Society of Friends (Quaker), UUA, UCC, the Anglican Church of Canada, Evangelical Lutheran Church in Canada, and United Church of Canada.
In 2015, the Mennonite Church Canada saw its first same-sex marriage in one of its congregations.
The American Baptist Churches USA allows each congregation the freedom to decide for itself. Some congregations of the Church of the Brethren have also voted to perform same-gender marriages although the national denomination opposes this practice.
While the UMC does not nationally ordain gay or lesbian clergy, the New York Annual Conference, a regional body of the UMC, has ordained the denomination's first openly gay and lesbian clergy. The Western Jurisdiction of the UMC also elected the denomination's first openly gay bishop.
The term "mainline" once implied a certain numerical majority or dominant presence in mainstream society, but that is no longer the case. Protestant churches as a whole have slowly declined in total membership since the 1960s. As the national population has grown these churches have shrunk from 63% of the population in 1970 to 54% by 2000, and 40% in 2024, ceasing to be the religious category for the majority of Americans. American affiliation with mainline denominations declined from 55% of all Protestants in 1973 to 29% in 2024. The number of mainline congregations in the U.S. declined from more than 80,000 churches in the 1950s to about 72,000 in 2008. Robert Drinan estimated that there may have been a hundred million Mainline Protestants at one time in the United States.
Various causes of mainline decline in population have been cited. Much analysis has taken place both from those within and outside mainline denominations. Key factors indicate that all types of churches can and do grow, regardless of hymnody or contemporary music, type of liturgy, average age of worshiper, or location On average, however, churches in rural areas, churches with older congregants, and churches with fewer young people involved struggle most to add members and grow churches. For example, of all churches founded since 1993, 54% are experiencing growth, compared to 28% of congregations founded prior to 1900. As demographics change, the churches founded by earlier generations often struggle to adapt to changing conditions, including the declines or shifts in the age and ethnicity of local populations. Says David Roozen, Director of Hartford Seminary's Hartford Institute for Religion Research, "Location, Location, Location used to be the kind way that researchers described the extent to which the growth or decline of American congregations was captive to the demographic changes going on in their immediate neighborhoods." Age demographics are also a real factor in congregational decline, with the birthrate for mainline Protestants well below what is needed to maintain membership numbers.
While various Protestant denominations have experienced declining membership, the most pronounced changes have occurred among mainline churches. Demographic trends for evangelical and historically African-American churches have been more stable. According to the Pew Research Center, mainline denominations could claim 11.5 percent of all US adults, compared to 23.1 percent who identified as evangelical in 2024.
Demographers Hout, Greeley, and Wilde have attributed the long-term decline in mainline membership and the concomitant growth in the conservative Protestant denominations to four basic causes: birth rates; switching to conservative denominations; departure from Protestantism to "no religion" (i.e. secularization); and conversions from non-Protestant sources. In their analysis, by far the main cause is birth rates—low for the mainline bodies, and high for the conservatives. The second most important factor is that fewer conservatives switch to mainline denominations than before. Despite speculation to the contrary, Hout, Greeley, and Wilde argue that switching from a mainline to a conservative denomination is not important in accounting for the trend, because it is fairly constant over the decades. Finally, conservative denominations have had a greater inflow of converts. Their analysis gives no support for the notion that theological or social conservatism or liberalism has much impact on long-term growth trends.
The Pew Research Center's 2023-2024 Religious Landscape Study provide additional explanations for the decline.
Not paralleling the decline in membership is the household income of members of mainline denominations. Overall, it is higher than that of evangelicals:
While the term "mainline" was not applied to churches until the 20th century, mainline churches trace their history to the Protestant Reformation of the 16th century. The largest and most influential Protestant denominations in Britain's Thirteen Colonies were the Anglicans (after the American Revolution called Episcopalians) and the Congregationalists (from which the Unitarians would later split). These were later surpassed in size and influence by the evangelical denominations: the Baptists, Presbyterians and Methodists. Sharing a common Reformation heritage with Episcopal and Congregational churches, these denominations together created the mainline. It was, according to historian Jason Lantzer, "the emerging evangelical movement that would help forge the Seven Sisters and which provides a core to the wide variety of theological and doctrinal differences, shaping them into a more coherent whole."
Mainline Protestants were a majority of Protestants in the United States until the mid-20th century. A dip in membership across all Christian denominations was more pronounced among mainline groups, with the result that mainline groups no longer comprise the majority. In 2020, Public Religion Research Institute conducted a religious census, based on self-identification, finding that an estimated 16% of U.S. Americans identified as non-Hispanic white mainline Protestants, slightly outnumbering non-Hispanic white evangelical Protestants who were 14% of the American population. In 2014, Pew Research completed and published the Religious Landscape Survey in which it was estimated that 14.7% of American adults identified as mainline Protestant, excluding historically Black and African American denominations, while 25.4% identified as evangelical Protestants, also excluding membership in historically Black denominations. In 2025, Pew Research published an updated Religious Landscape Survey, finding that 11% of American adults identified as mainline Protestant while 23% identified as evangelical Protestants.
Mainline churches share an active approach to social issues that often leads to cooperation in organizations such as the National Council of Churches. Because of their involvement with the ecumenical movement, mainline churches are sometimes (especially outside the United States) given the alternative label of ecumenical Protestantism. These churches played a leading role in the Social Gospel movement and were active in social causes such as the civil rights movement and the women's movement. As a group, the mainline churches have maintained religious doctrine that stresses social justice and personal salvation. Members of mainline denominations have played leadership roles in politics, business, science, the arts, and education. They were involved in the founding of leading institutes of higher education. Marsden argues that in the 1950s, "Mainline Protestant leaders were part of the liberal-moderate cultural mainstream, and their leading spokespersons were respected participants in the national conversation."
Some mainline Protestant denominations have the highest proportion of graduate and post-graduate degrees of any other denomination in the United States. Some also include the highest proportion of those with some college education, such as the Episcopal Church (76%), the Presbyterian Church (U.S.A.) (64%), and the United Church of Christ (46%), as well as most of the American upper class. compared with the nationwide average of 50%. Episcopalians and Presbyterians also tend to be considerably wealthier and better educated than most other religious groups, and they were disproportionately represented in the upper reaches of US business and law until the 1950s.
From 1854 until at least 1964, Mainline Protestants and their descendants were heavily Republican. In recent decades, Republicans slightly outnumber Democrats.
From 1965 to 1988, mainline church membership declined from 31 million to 25 million, then fell to 21 million in 2005. While in 1970 the mainline churches claimed most Protestants and more than 30 percent of the population as members, today they are a minority among Protestants; in 2009, only 15 percent of Americans were adherents. A Pew Forum statistic revealed the same share in 2014.
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World Encyclopaedia of Interfaith Studies: World religions. Jnanada Prakashan. 2009. ISBN 978-81-7139-280-3. In the most common sense, "mainstream" refers to Nicene Christianity, or rather the traditions which continue to claim adherence to the Nicene Creed. 978-81-7139-280-3
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