Confessionalism (religion) in the context of "Confessing Movement"

Non-denominational Christianity (or nondenominational Christianity) consists of churches, and individual Christians, which typically distance themselves from the confessionalism or creedalism of other Christian communities by not formally aligning with a specific Christian denomination.

In North America, nondenominational Christianity arose in the 18th century through the Stone-Campbell Restoration Movement, with followers organizing themselves simply as "Christians" and "Disciples of Christ". The nondenominational movement saw expansion during the 20th century Jesus movement era, which popularized contemporary Christian music and Christian media within global pop culture.

The mainline Protestants (sometimes also known as oldline Protestants) are a group of Protestant denominations in the United States and Canada largely of the theologically liberal or theologically progressive persuasion that contrast in history and practice with the largely theologically conservative evangelical, fundamentalist, charismatic, confessional, Confessing Movement, historically Black church, and Global South Protestant denominations and congregations. 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 Protestant churches have stressed social justice and personal salvation and, both politically and theologically, tend to be more liberal than non-mainline Protestant churches. Mainline Protestant churches share a common approach that often leads to collaboration in organizations such as the National Council of Churches, and because of their involvement with the ecumenical movement, they are sometimes given the alternative label of ecumenical Protestantism (especially outside the United States). While in 1970 the mainline Protestant churches claimed most Protestants and more than 30 percent of the American population as members, as of 2009 they were a minority among American Protestants, claiming approximately 15 percent of American adults. In 2024, approximately 13.1% of Americans were white non-Hispanic mainline Protestants according to the Public Religion Research Institute's Census of American Religion.

Conservative Christianity, also known as conservative theology, theological conservatism, traditional Christianity, or biblical orthodoxy is a grouping of overlapping and denominationally diverse theological movements within Christianity that seeks to retain the orthodox and long-standing traditions and beliefs of Christianity. It is contrasted with Liberal Christianity and Progressive Christianity, which are seen as heretical heterodoxies by theological conservatives. Conservative Christianity should not be mistaken as being necessarily synonymous with the political philosophy of conservatism, nor the Christian right (which is a political movement of Christians who support conservative political ideologies and policies within the realm of secular or non-sectarian politics).

Theological conservatism is found in Roman Catholicism, Eastern Orthodoxy, Oriental Orthodoxy, Protestantism, the Church of the East, Old Catholicism, and throughout all of Mainstream-Nicene Christianity in both Western Christian and Eastern Christian traditions. Within Protestantism, it is largely made up of Evangelical Christianity and Christian Fundamentalism, while the Confessing Movement, Confessionalism, and to an extent Neo-orthodoxy make up the remaining; in Roman Catholicism it is inclusive of Catholics that adhere to Traditionalist Catholicism as well as the Magisterium, Scriptures, and Traditions of the Church at the exclusion of Catholic Modernism and Folk Catholicism; and in Old Catholicism it currently includes the Union of Scranton, those of similar beliefs, and historically the Union of Utrecht until its adoption of theological liberalism. In spite of this, not every community has had a direct connection with the Fundamentalist–Modernist controversy.