The mainline Protestant churches (also called mainstream American Protestant and oldline Protestant) are a group of Protestant churches in the United States that contrast in history and practice with evangelical, fundamentalist, and charismatic Protestant denominations. Mainline Protestants were a majority of all Christians in the United States until the mid-20th century, but now constitute a minority among Protestants. Mainline churches include the so-called Seven Sisters of American Protestantism—the United Methodist Church (UMC), the Evangelical Lutheran Church in America (ELCA), the Presbyterian Church (U.S.A.) (PCUSA), the Episcopal Church (TEC), the American Baptist Churches (ABCUSA), the United Church of Christ (UCC), and the Disciples of Christ—as well as the Quakers, Reformed Church in America (RCA), and other churches. The term 'mainline' has also been applied to Canadian Protestant churches that share common origins with their US counterparts. In Mexico, the Anglican Church is historically tied to and formed from the US Episcopal Church. The term is also occasionally used to refer to historic Protestant churches in Europe, Latin America, and South Africa.
Mainline churches share a liberal approach to social issues that often leads to collaboration 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 civil rights and equality for women. As a group, the mainline churches have maintained religious doctrine that stresses social justice and personal salvation. Politically and theologically, mainline Protestants are more liberal than non-mainline Protestants.
Members of mainline denominations have played leadership roles in many aspects of life, including politics, business, science, the arts, and education. They founded most of the country's 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, such as the Episcopal Church (76%), the Presbyterian Church (U.S.A.) (64%), and the United Church of Christ (46%), as well as the most of the American upper class. Episcopalians and Presbyterians also tend to be considerably wealthier and better educated than most other religious groups, and they are disproportionately represented in the upper reaches of American business and law. From 1854 until at least 1964, they were heavily Republican. In recent decades, Republicans slightly outnumber Democrats.
Since the 1960s, however, mainline groups have shrunk as a percentage of the population as increasing numbers of Protestants have come to affiliate instead with fundamentalist, evangelical, or charismatic churches, or with no church at all. Mainline denominations peaked in membership in the 1950s and have declined steadily in the last half century. 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.
The term mainline Protestant was coined during debates between modernists and fundamentalists in the 1920s.[page needed] Several sources claim that the term is derived from the Philadelphia Main Line, a group of affluent suburbs of Philadelphia; most residents belonged to mainline denominations. Today, most mainline Protestants remain rooted in the Northeastern and Midwestern United States. Charles H. Lippy defines the term as follows: "the term 'mainline Protestant' is used along with 'mainstream Protestant' and 'oldline Protestant' to categorize denominations that are affiliated with the National Council of Churches and have deep historic roots in and long-standing influence on American society."
In the US, Protestantism is generally divided between mainline denominations and evangelical or 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 ethnocentric and elitist assumptions, since it almost exclusively described white, non-fundamentalist Protestant Americans from its origin to the late twentieth century.[page needed][page needed]
Mainline vs. mainstream
The term mainstream Christian in academic usage is not equivalent to mainline Protestant and is often used as an attempt to find non-loaded sociological vocabulary in distinguishing orthodoxy and heresy. Hence in christological and doctrinal reference mainstream Christianity is often equivalent to Trinitarianism. In the United Kingdom and Australia, the term mainline Protestant is not used, and mainstream does not mean progressive Protestant.
- With almost 7.7 million members in the United States in 2009, the United Methodist Church is the largest mainline Protestant denomination
- The second largest mainline denomination is the Evangelical Lutheran Church in America (ELCA), with more than 4 million members and 10,000 congregations in 2015.
- The third largest mainline denomination is the Presbyterian Church (USA) with 2.8 million members and 1.6 million active members.
- Fourth in size is the Episcopal Church, with nearly 2 million members in the United States in 2012. When adherents are included, Church Pension Group estimated the church had 3.5 million adherents.
- American Baptist Churches USA are fifth in size, with approximately 1.3 million members (2008)
- The United Church of Christ has a little over 998,000 members in 2012
- The Christian Church (Disciples of Christ) has a little over 625,000 as of 2012. As of 2012, their Yearbook & Directory claims 625,252 members in 3,627 congregations.
- United Church of Canada 2 million adherents (2011)
- Anglican Church of Canada 1.6 million adherents (2011)
- Cooperative Baptist Fellowship 700,000 members
- Religious Society of Friends (Quakers) 350,000 members
- Reformed Church in America 250,938 members (2009)
- Presbyterian Church in Canada 225,346 members
- Evangelical Lutheran Church in Canada 128,026
- Church of the Brethren 125,964 members (2008)
- Anglican Church of Mexico 100,000
- Mennonite Church USA 100,000 members
- International Council of Community Churches 69,276 members (2009)
- National Association of Congregational Christian Churches 65,392 members (2002)*
- Alliance of Baptists 65,000 members
- Moravian Church in North America 60,000 members
- Mennonite Church Canada 31,000 members
- Universal Fellowship of Metropolitan Community Churches 15,666 members (2006)
- Latvian Evangelical Lutheran Church in America 12,000 members (2007)
- Estonian Evangelical Lutheran Church Abroad 8,000 members
- Hungarian Reformed Church in America 6,080 members
- Christian Church (Disciples of Christ) in Canada 2,606 members
- Congregational Christian Churches, (not part of any national CCC body)
The Association of Religion Data Archives has difficulties collecting data on traditionally African American denominations. Those churches most likely to be identified as mainline include these Methodist groups:
- African Methodist Episcopal Church 2.5 million members
- African Methodist Episcopal Zion Church 1.4 million members
- Christian Methodist Episcopal Church 858,670 members
Some denominations with similar names and historical ties to mainline groups are not considered mainline. The Southern Baptist Convention, Lutheran Church – Missouri Synod, the Christian and Missionary Alliance (C&MA), the Churches of Christ, the Presbyterian Church in America (PCA), and the Anglican Church in North America (ACNA) are often considered too conservative for this category and thus grouped as evangelical.
*The National Association of Congregational Christian Churches is considered to be evangelical by Pew Research while the Association of Religion Data Archives considered it to be mainline.
Mainline Protestantism is characterized by theological and ideological pluralism. While doctrinal standards and confessional statements exist, these are not usually interpreted in ways to exclude people from membership. Richard Hutcheson, Jr., chairman of the Office of Review and Evaluation of the Presbyterian Church in the United States, observed that clergy candidates were more likely to be rejected due to "excessive narrowness" than for violating confessional standards.
Mainline churches hold a range of theological orientations—conservative, moderate and liberal. About half of mainline Protestants describe themselves as liberal. Mainline Christian groups are often more accepting of other beliefs and faiths, affirm the ordination of women, and have become increasingly affirming of gay ordination. Nearly one-third of mainline Protestants call themselves conservative, and most local mainline congregations have a strong, active conservative element. Mainline denominations are historically Trinitarian and proclaim Jesus Christ as Lord and Son of God.
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 only 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.
It has been noted, even by members of mainline churches, that the leadership of denominational agencies and bureaucracies has often been more theologically and socially liberal than the overall membership of the mainline churches. This gap has caused feelings of alienation among conservative mainline Protestants. This dissatisfaction has led to the formation of various Confessing Movements or charismatic renewal movements which are more conservative in tone.
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.
Mainline churches were basically pacifistic before 1940, but under the influence of people such as Reinhold Niebuhr they supported World War II and the Cold War. They have been far from uniform in their reaction to homosexual behavior, though generally more accepting than the Catholic Church or the more conservative Protestant churches.
Many mainline denominations are active in voicing perspectives on social issues. Almost all mainline denominations are gender-inclusive and ordain women. On reproductive health issues, 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.
Regarding human sexuality, TEC, the ELCA, PC(USA), Society of Friends (Quaker), UUA, and UCC permit same-gender marriages. Also considered mainline, the Anglican Church of Canada, Evangelical Lutheran Church in Canada, and United Church of Canada bless or marry same-gender couples. In 2015, the Mennonite Church Canada saw its first same-gender marriage in one of its congregations. The American Baptist Churches USA does not endorse gay marriage, but allows each congregation the freedom to decide for itself. Including the aforementioned denominations, the Mennonite Church USA, Metropolitan Community Church, and Moravian Church Northern Province license or ordain openly gay clergy. 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. Some congregations of the Church of the Brethren have also voted to perform same-gender marriages although the national denomination opposes it.
Most of the above denominations also ordain openly transgender clergy. While the national church has not approved of gay or lesbian clergy, the UMC has allowed transgender pastors.
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 but also identified as mainline, Hillary Clinton was invited to offer an address for the delegates and clergy.
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 they have shrunk from 63% of the population in 1970 to 54% by 2000, and 48% in 2012, ceasing to be the religious category for the majority of Americans. The mainline denominations slipped from 55% of all Protestants in 1973 to 46% in 1998. 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.
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 less youth involved struggle most to add members and grow churches. For example, of all churches founded since 1993, 54% are experiencing growth, while that is true for only 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 cannot be overlooked as a real factor in congregational decline, with the birthrate for mainline Protestants well below what is needed to maintain membership numbers.
As congregational needs change, the institutions of mainline Protestant have struggled to adapt. The Barna Group, an Evangelical surveyor, has noted, Protestant pastors who serve mainline churches serve on average half as long as Protestant pastors in non-mainline churches. This may contribute to decline and is influenced in part by the United Methodist Church practice of Itinerancy, where clergy are intentionally moved from one church to another as often as yearly in an effort to support and encourage the United Methodist tradition of strong lay ministry. Mainline churches have also had difficulty attracting minorities, particularly Hispanics. Hispanics comprise 6 percent of the mainline population but 16 percent of the US population. The Barna Group, considers the failure of mainline Protestants to add substantial numbers of Hispanics to be portent for the future, given both the rapid increase of the Hispanic population as well as the outflow of Hispanics from Catholicism to Protestant churches in the past decade, most of whom are selecting evangelical or Pentecostal Protestant churches.
In general, however, decline can be a difficult thing to statistically quantify. Many older Protestant churches lived a vibrant lifetime and continue to evidence vital ministry and faith regardless of declining populations or birthrates. For example, giving and engagement with need and justice, both indicators of strong Christian faith, have increased despite the aging and loss of congregational members.
Contrast with other Protestant denominations
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 churches could claim 14.7 percent of all US adults compared to 25.4 percent who belonged to evangelical churches in 2014.
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.
Evidence from the General Social Survey indicates that higher fertility and earlier childbearing among women from conservative denominations explains 76% of the observed trend: conservative denominations have grown their own. Mainline denomination members have the lowest birthrate among American Christian groups. Unless there is a surge of new members, rising death rates are predicted to diminish their ranks even further in the years ahead.
Some other findings of the Barna Group:
- From 1958 to 2008, mainline church membership dropped by more than one-quarter to roughly 20 million people—15 percent of all American adults.
- From 1998 to 2008, there was a 22 percent drop in the percentage of adults attending mainline congregations who have children under the age of 18 living in their home.
- In 2009, nearly 40 percent of mainline church attendees were single. This increase has been driven higher by a rise in the number of divorced and widowed adherents.
- From 1998 to 2008, volunteerism dropped 21 percent; adult Sunday school participation decreased 17 percent.
- The average age of a mainline pastor in 1998 was 48 and increased to 55 by 2009.
- Pastors on average remain with a congregation for four years compared to twice that length for non-mainline church leaders.
Recent statistics from the Pew Forum provide additional explanations for the decline.
- Evangelical church members are younger than those in mainline denominations. Fourteen percent of evangelical congregations are between 18 and 29 (compared to 2 percent), 36 percent between 30 and 49, 28 percent between 50 and 64, and 23 percent 65 or older.
Not paralleling the decline in membership is the household income of members of mainline denominations. Overall, it is higher than that of evangelicals:
- 25% Reported less than a $30,000 income per year.
- 21% Reported $30,000–$49,999 per year.
- 18% Reported $50,000–$74,999 per year.
- 15% Reported $75,000–$99,999 per year.
- 21% Reported an income of $100,000 per year or more, compared to only 13 percent 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 13 colonies were the Anglicans (Episcopalians) and the Puritans (Congregationalists). 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."
The Great Awakening ignited controversy within Protestant churches between Old Lights and New Lights (or Old Side and New Side among Presbyterians). Led by figures such as the Congregationalist minister Charles Chauncy, Old Lights opposed the evangelical revivalism at the heart of the Awakening, while New Lights, led by fellow Congregationalist minister Jonathan Edwards, supported the revivals and argued for the importance of having a conversion experience. By the 1800s, Chauncy's followers had drifted toward forms of theological liberalism, such as Universalism, Unitarianism and Transcendentalism.
The Second Great Awakening would inaugurate a period of evangelical dominance within American mainline Protestantism that would last over a century. The Second Great Awakening was a catalyst for the reform of society. Efforts to improve the rights of women, reforming prisons, establishing free public schools, prohibiting alcohol, and (in the North) abolishing slavery were promoted by mainline churches.
After the Civil War, however, tensions between evangelicals and non-evangelicals would re-emerge. As the practice of historical criticism spread from Germany to the United States, conflict over biblical inspiration erupted within Protestant churches. Conservative Protestants led by A. A. Hodge, B. B. Warfield and other Princeton theologians argued for biblical inerrancy, while liberal theologians such as Charles A. Briggs of Union Theological Seminary were open to using historical criticism to understand the Bible.
As 19th–century evangelicals embraced dispensational premillennialism and retreated from society in the face of mounting social problems caused by industrialization, urbanization and immigration, liberal Protestants embraced the Social Gospel, which worked for the "regeneration of society" rather than only the conversion of individuals.
The Fundamentalist–Modernist Controversy of the 1920s widened the division between evangelical and non-evangelical Protestants as the two sides fought for control over the mainline denominations. The fundamentalists lost these battles for control to the modernists or liberals. Since the 1920s, mainline churches have been associated with liberal Protestantism.
Through the 1940s and 1950s, neo-orthodoxy had become the prevailing theological approach within the mainline churches. This neo–orothodox consensus, however, gave way to resurgent liberal theologies in the 1960s and to liberation theology during the 1970s.
- Moorhead 1999, pp. xxii,241.
- Lippy 2006, "The Mainline Prior to the Era of Decline".
- Roozen 2004.
- McKinney 2010.
- Barrick 1989.
- Pew Research Center 2015b, p. 108.
- Fallding 1978.
- "Bienvenidos a la Iglesia Anglicana de México". mexico-anglican.org. Retrieved 2016-06-20.
- "The Rise of Liberal Religion". Retrieved 2016-06-28.
- "Why has Pentecostalism grown so dramatically in Latin America?". 2014-11-14. Retrieved 2016-06-28.
- "Mainline Protestantism in South Africa and modernity". 2008-09-05. Retrieved 2016-06-28.
- Wuthnow & Evans 2002, p. 4.
- Hutcheson 1981, pp. 36-7.
- Oliver 2010, p. 174.
- Chang, Perry. "Recent Changes in Membership and Attendance. " Presbyterian Church (U. S. A.) Nov. 2006. Web: Presbyterian Church (U. S. A.)
- McKinney 1998, pp. 57-66..
- Marsden 2014, p. 99.
- Faith, Education and Income
- Pew Research Center 2015b, p. 133.
- Pew Research Center 2008, p. 85.
- Leonhardt 2011.
- Ayres 1981.
- Irving Lewis Allen, "WASP—From Sociological Concept to Epithet," Ethnicity, 1975 154+
- Hacker 1957, p. 1011.
- Baltzell 1964, p. 9.
- Pew Research Center 2015a, p. 11.
- Noll 1992, p. 465.
- Ellen W. Linder, ed. Yearbook of American & Canadian Churches: 2009 (2009)
- Hout, Greeley & Wilde 2001.
- Report Examines the State of Mainline Protestant Churches The Barna Group. December 7, 2009. Web: 12 Dec. 2009
- "America's Changing Religious Landscape". Pew Research Center: Religion & Public Life. May 12, 2015.
- Walsh 2000:"The term 'mainline Protestant' was coined during the modernist/ fundamentalist debates of the 1920s."
- Lindsay, D. Michael. "Faith in the Halls of Power" Archived September 27, 2011, at the Wayback Machine.
- Hutcheson 1981, p. 27.
- Marty 1980:"the term 'Mainline' may be as unfortunate as the pejorative-sounding WASP, but it is no more likely to fall into disuse and may as well be … Mainline religion had meant simply white Protestant until well into the twentieth century."
- Coalter, Mulder & Weeks 1990:"Some would say the term 'mainstream' or 'mainline' is itself suspect and embodies ethnocentric and elitist assumptions. ... be dropped in favor of talking about 'liberal' Protestantism, but such a change presents additional problems".
- Ismo Dunderberg Beyond gnosticism: myth, lifestyle, and society 2008 'with theological meaning, such as replacing "orthodoxy" with "mainstream Christianity" and "heresy" with terms like "sect,"24 "splinter group," or something similar. These designations may create the impression of greater neutrality and ...'
- Protestant Establishment I (Craigville Conference) at the Wayback Machine (archived September 28, 2007)
- Hutchison, William, Between the Times: The Travail of the Protestant Establishment in America, 1900-1960 (1989), Cambridge U. Press, ISBN 0-521-40601-3
- 2009 US Annual Conference Membership Summary GCFA
- "Home". ELCA.org. Retrieved 2016-05-02.
- (U.S.A.), Presbyterian Church (2014-02-03). "Presbyterian Church (U.S.A.) - News & Announcements - Presbyterians seek unity—or amicable split—on gay clergy". www.pcusa.org. Retrieved 2016-06-03.
- (U.S.A.), Presbyterian Church (2016-05-16). "Presbyterian Church (U.S.A.) - News & Announcements - Local mission giving in PC(USA) churches increases in 2015". www.pcusa.org. Retrieved 2016-06-03.
- Baptized Members by Province and Diocese 2002-2012 (PDF), The Episcopal Church, 2012, p. 4, retrieved 2014-06-03
- Price, Matthew J. (2002). "Will There Be a Clergy Shortage? Analysis and Predictions For Uncertain Times". cpg.org. Church Pension Group. Retrieved May 1, 2016.
- "NCC – 2009 Yearbook of American & Canadian Churches". Wfn.org. 2009-02-23. Retrieved 2014-05-10.
- "American Baptist Churches in the U.S.A.". The Association of Religion Data Archives. Archived from the original on May 8, 2011. Retrieved 2011-05-27.
- The United Church of Christ: A Statistical profile United Church of Christ
- Christian Church (Disciples of Christ) - The Association of Religion Data Archives
- Howard E. Bowers, ed. Yearbook & Directory 2012 of the Christian Church (Disciples of Christ) (Indianapolis, IN: Office of the General Minister and President, 2013), 552-53.
- "Mainline protestant denominations". Thearda.com. Retrieved 2014-05-10.
- "History of The United Church of Canada". The United Church of Canada. 2015-11-02. Retrieved 2016-05-24.
- "Number of Canadian Anglicans, Parishes and Congregations - Anglican Church of Canada". Anglican Church of Canada. Retrieved 2016-05-24.
- "CBF lists churches 'represented' at assembly; declines to name partner churches". Baptist Press. Retrieved 2016-05-02.
- "Reformed membership". Thearda.com. Retrieved 2014-05-10.
- "Address data base of Reformed churches and institutions". www.reformiert-online.net. Retrieved 2016-05-24.
- "Canada | The Lutheran World Federation". www.lutheranworld.org. Retrieved 2016-05-24.
- "Anglicanos mexicanos rechazan unirse a la Iglesia católica". www.cronica.com.mx. Retrieved 2016-06-20.
- "Church Structure - Mennonite Church USA". Mennonite Church USA. Retrieved 2016-05-02.
- "Reporting on Protestant Christianity". ReligionLink. 2012-05-25. Retrieved 2016-05-02.
- "ICCC membership". Thearda.com. Retrieved 2014-05-10.
- "NACCC membership". Thearda.com. Retrieved 2014-05-10.
- "UCC religious freedom lawsuit adds additional plaintiffs, defendants request stay". United Church of Christ. Retrieved 2016-05-02.
- "A Brief History of the Moravian Church « The Moravian Church « Moravian Church of North America". www.moravian.org. Retrieved 2016-05-02.
- "About Mennonite Church Canada | Mennonite Church Canada". home.mennonitechurch.ca. Retrieved 2016-06-06.
- "In Search of an Amish Church". www.beliefnet.com. Retrieved 2016-06-06.
- "UFMCC membership". Thearda.com. Retrieved 2014-05-10.
- Lau, David; Mayhew, Nathanael. "A Brief History of the Lutheran Churches in America" (PDF). atlanta.clclutheran.org. atlanta.clclutheran.org. Retrieved May 1, 2016.
- "Hungarian Reformed Church in America – World Council of Churches". www.oikoumene.org. Retrieved 2016-05-02.
- "Christian Church (Disciples of Christ) in Canada – World Council of Churches". www.oikoumene.org. Retrieved 2016-06-06.
- "African Methodist Episcopal Church – World Council of Churches". www.oikoumene.org. Retrieved 2016-05-02.
- "African Methodist Episcopal Zion Church – World Council of Churches". www.oikoumene.org. Retrieved 2016-05-02.
- "Christian Methodist Episcopal Church – World Council of Churches". www.oikoumene.org. Retrieved 2016-05-02.
- "Unitarian faith growing nationwide". USA TODAY. Retrieved 2016-06-03.
- "Unitarian Universalist Affirmation of Gay, Lesbian, Bisexual, and Transgender People | UUA.org". UUA.org. 2012-08-21. Retrieved 2016-06-03.
- Street, 1615 L.; NW; Washington, Suite 800; Inquiries, DC 20036 202 419 4300 | Main 202 419 4349 | Fax 202 419 4372 | Media (2015-05-12). "Appendix B: Classification of Protestant Denominations". Pew Research Center's Religion & Public Life Project. Retrieved 2016-07-06.
- Hutcheson 1981, p. 21.
- Struckmeyer, Kurt. "Mainline Christianity. " Following Jesus Web: 13 Dec 2009
- U. S. Religious Landscape Survey: Religious Beliefs and Practices, Diverse and Politically Relevant. Washington D. C.: Pew Forum on Religion and Public Life. June 2008. Web: September 27, 2009 at Pew Forum Report 2008.
- Hutcheson 1981, p. 20.
- Michael G. Thompson, "An Exception to Exceptionalism: A Reflection on Reinhold Niebuhr's Vision of "Prophetic" Christianity and the Problem of Religion and U.S. Foreign Policy, " American Quarterly, Volume 59, Number 3, September 2007, pp. 833-855
- Gary Dorrien, The Making of American Liberal Theology: Crisis, Irony, and Postmodernity, 1950–2005 (2006)
- "The divide over ordaining women". Pew Research Center. 2014-09-09. Retrieved 2016-06-03.
- "Coalition Members | Religious Coalition For Reproductive Choice". rcrc.org. Retrieved 2016-06-03.
- Communications, United Methodist. "What is the United Methodist position on abortion? - The United Methodist Church". The United Methodist Church. Retrieved 2016-06-03.
- "Abortion". ELCA.org. Retrieved 2016-06-03.
- "1984 Abortion". www.brethren.org. Retrieved 2016-06-15.
- Services, From Times Wire (2003-07-12). "Mennonites Approve Dual Policy on Abortion". Los Angeles Times. ISSN 0458-3035. Retrieved 2016-06-15.
- "Where Christian churches, other religions stand on gay marriage". Pew Research Center. 2015-12-21. Retrieved 2016-06-03.
- "Same Sex Blessings/Homosexuality - Anglican Church of Canada". Anglican Church of Canada. Retrieved 2016-06-03.
- "Evangelical Lutherans back same-sex marriage". www.winnipegfreepress.com. Retrieved 2016-06-03.
- "United Church endorses gay marriage". www.cbc.ca. Retrieved 2016-06-03.
- "First MC Canada-officiated same-sex marriage". The Mennonite: A Publication of Mennonite Church USA Providing Anabaptist Content. Retrieved 2016-06-06.
- "Gay marriage: mainline denominations affirm SCOTUS". Baptist Press. Retrieved 2016-06-03.
- "Another conference to license gay pastor". Mennonite World Review. 2014-10-27. Retrieved 2016-06-03.
- "Moravian Church Northern Province Synod approves ordination of gay and lesbian pastors « Northern Province Synod 2014 « Moravian Church of North America". www.moravian.org. Retrieved 2016-06-03.
- "33 Ordained, Commissioned in "Historic" Service". www.nyac.com. Retrieved 2016-06-13.
- Communications, United Methodist. "Western Jurisdiction elects openly gay United Methodist bishop - The United Methodist Church". The United Methodist Church. Retrieved 2016-07-19.
- firstname.lastname@example.org, SHERRY VAN ARSDALL. "Goshen church votes Sunday to allow same-sex marriages". Goshen News. Retrieved 2016-06-15.
- "Religious groups' policies on transgender members vary widely". Pew Research Center. 2015-12-02. Retrieved 2016-06-03.
- "Hillary Clinton to Address AME Church Conference in Philadelphia". Retrieved 2016-07-08.
- "MYTHS AND FACTS ABOUT EVANGELISM AND CHURCH GROWTH". USCLS U.S. Congregational Life Survey. Retrieved May 15, 2015.
- "Facts On Growth 2010" (PDF). Faith Communities Today. Cooperative Congregations Studies Partnership. Retrieved May 15, 2015.
- "Facts on Growth: 2010 If Congregations Can Change, They Can Grow". Faith Communities Today. Cooperative Congregations Studies Partnership. Retrieved May 15, 2015.
- Gryboski, Michael. "United Methodist Church Continues to Decline in America, but Gains in Africa". Christian Post. The Christian Post. Retrieved May 15, 2015.
- "Mixed blessings in new U.S. church numbers". United Methodist Church. United Methodist Church. Retrieved May 15, 2015.
- Pew Research Center 2015, p. 20-1.
- Hout, Greeley & Wilde 2001, p. 469.
- Hout, Greeley & Wilde 2001, p. 494-5.
- Lantzer 2012, p. 19.
- Lantzer 2012, p. 29.
- Balmer 2002, pp. 14-5.
- Lantzer 2012, p. 31.
- Balmer 2002, p. 19.
- Balmer 2002, p. 15.
- Ayres, B. Drummond, Jr. (April 28, 1981). "The Episcopalians: An American Elite with Roots Going Back to Jamestown". New York Times. Retrieved May 21, 2016.
- Balmer, Randall H.; Winner, Lauren F. (2002), Protestantism in America, Columbia University Press, ISBN 9780231111300
- Baltzell, E. Digby (1964), The Protestant Establishment
- Barrick, Audrey (November 8, 1989), "Survey Tracks Trends in Evangelical, Oldline Congregations", Christian Post, retrieved 9 January 2012
- Coalter, Milton J.; Mulder, John M.; Weeks, Louis (1990), The Mainstream Protestant "Decline": The Presbyterian Pattern, Westminster John Knox Press, ISBN 0664251501
- Fallding, Harold (Spring 1978). "Mainline Protestantism in Canada and the United States of America: An Overview". The Canadian Journal of Sociology / Cahiers canadiens de sociologie. 3 (2): 141–160. doi:10.2307/3340276. JSTOR 3340276.
- Hacker, Andrew (1957), "Liberal Democracy and Social Control", American Political Science Review, 51 (4): 1009–1026, JSTOR 1952449
- Hout, Michael; Greeley, Andrew; Wilde, Melissa J. (September 2001). "The Demographic Imperative in Religious Change in the United States". American Journal of Sociology. 107 (2): 468–500. doi:10.1086/324189.
- Hutcheson, Richard G., Jr. (1981), Mainline Churches and the Evangelicals: A Challenging Crisis?, Atlanta, Georgia: John Knox Press
- Lantzer, Jason S. (2012), Mainline Christianity : The Past and Future of America's Majority Faith, New York: NYU Press, ISBN 9780814753309
- Leonhardt, David (May 13, 2011). "Faith, Education and Income". The New York Times. Retrieved May 24, 2016.
- Lippy, Charles H. (2006), Faith in America: Organized Religion Today
- Marsden, George (2014), The Twilight of the American Enlightenment
- Marty, Martin E. (1980), A Nation of Behavers, University of Chicago Press, ISBN 0226508927
- McKinney, William (July 1998). "Mainline Protestantism 2000". Annals of the American Academy of Political and Social Science. 558: 57–66. JSTOR 1049104.
- McKinney, William (March 12, 2010), "Revisioning the Future of Oldline Protestantism", The Christian Century, pp. 1014–1016, retrieved 9 January 2012
- Moorhead, James H. (1999), World Without End: Mainstream American Protestant Visions of the Last Things, 1880–1925, Bloomington, Indiana: Indiana University Press
- Noll, Mark A. (1992), A History of Christianity in the United States and Canada
- Oliver, Thomas (March 1, 2010). "Where Have All the Protestants Gone?". USA Today.
- Pew Research Center (February 2008), U.S.Religious Landscape Survey: Religious Affiliation: Diverse and Dynamic (PDF), Washington, DC: Pew Research Center, retrieved May 22, 2016
- Pew Research Center (April 2015a), A Deep Dive Into Party Affiliation: Sharp Differences by Race, Gender, Generation, Education (PDF), Washington, DC: Pew Research Center, retrieved May 24, 2016
- Pew Research Center (May 12, 2015b), America's Changing Religious Landscape: Christians Decline Sharply as Share of Population; Unaffiliated and Other Faiths Continue to Grow (PDF), Washington, DC: Pew Research Center, retrieved May 22, 2016
- Roozen, David A. (2004), "Oldline Protestantism: Pockets of Vitality Within a Continuing Stream of Decline", Hartford Institute for Religion Research Working Paper 1104.1, Hartford Seminary, retrieved 9 January 2012
- Walsh, Andrew D. (2000), Religion, Economics, and Public Policy: Ironies, Tragedies, and Absurdities of the Contemporary Culture Wars, Westport, Connecticut: Praeger Publishers, ISBN 0-275-96611-9
- Wuthnow, Robert; Evans, John H. (2002), The Quiet Hand of God: Faith-Based Activism and the Public Role of Mainline Protestantism
- Ahlstrom, Sydney E. A Religious History of the American People (1976; 2004) excerpt and text search
- Balmer, Randall. Grant Us Courage: Travels along the Mainline of American Protestantism (1996) online edition
- Balmer, Randall, and Fitzmier, John R. The Presbyterians (1993). 274 pp. survey by two scholars
- Bendroth, Margaret, The Last Puritans: Mainline Protestants and the Power of the Past (U of North Carolina Press, 2015), 246 pp.
- Billingsley, K. L. From Mainline to Sideline: The Social Witness of the National Council of Churches (1991)
- Coffman, Elesha. The Christian Century and the Rise of Mainline Protestantism (Oxford, 2013), about The Christian Century magazine
- Dorrien, Gary. The Making of American Liberal Theology: Imagining Progressive Religion, 1805–1900 (2001); The Making of American Liberal Theology: Idealism, Realism, and Modernity, 1900–1950 (2003); The Making of American Liberal Theology: Crisis, Irony, and Postmodernity, 1950–2005 (2006).
- Edwards, Mark. The Right of the Protestant Left: God's Totalitarianism (Palgrave Macmillan, 2012)
- Hollinger, David A. After Cloven Tongues of Fire: Protestant Liberalism in Modern American History (Princeton University Press, 2013) 228 pp.
- Hutchison, William R. ed. Between the Times: The Travail of the Protestant Establishment in America, 1900-1960 (1990) excerpt and text search
- Lantzer, Jason S. Mainline Christianity: The Past and Future of America's Majority Faith (2012) excerpt and text search
- Marty, Martin E. "The Establishment That Was, " Christian Century November 15, 1989, p. 1045. online
- Marty, Martin E. Modern American Religion, Volume 3: Under God, Indivisible, 1941-1960 (1999)
- Murchison, William. Mortal Follies: Episcopalians and the Crisis of Mainline Christianity (2009)
- Roof, Wade Clark, and William McKinney. American Mainline Religion: Its Changing Shape and Future (1990) excerpt and text search
- Tipton, Steven M. Public Pulpits: Methodists and Mainline Churches in the Moral Argument of Public Life (2008) excerpt and text search
- Utter, Glenn H. Mainline Christians and U.S. public policy: a reference handbook (2007)