Mainline Protestants

The mainline Protestant churches (also called mainstream American Protestant and sometimes oldline Protestant) are a group of Protestant denominations in the United States that contrast in history and practice with evangelical, fundamentalist, and charismatic Protestant denominations. Some make a distinction between "mainline" and "oldline", with the former referring only to denominational ties and the latter referring to church lineage, prestige and influence. However, this distinction has largely been lost to history and the terms are now nearly synonymous.

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, the Evangelical Lutheran Church in America, the Presbyterian Church (USA), the Episcopal Church, the American Baptist Churches, the United Church of Christ, and the Disciples of Christ—as well as the Quakers, Reformed Church in America, 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 the civil rights movement and women's movement. 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."

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