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Within Italy, Poland, Lithuania, Transylvania, Hungary, Romania, and the United Kingdom, Unitarian Churches emerged from the Reformed tradition in the 16th century; the Unitarian Church of Transylvania is an example of such a denomination that arose in this era. They adopted the Anabaptist doctrine of credobaptism.

Various smaller Independent Catholic communities, such as the Old Catholic Church, include the word Catholic in their title, and arguably have more or less liturgical practices in common with the Catholic Church but are no longer in full communion with the Holy See.

Spiritual Christians, such as the Doukhobors and Molokans, broke from the Russian Orthodox Church and maintain close association with Mennonites and Quakers due to similar religious practices; all of these groups are furthermore collectively considered to be peace churches due to their belief in pacifism.

Messianic Judaism (or the Messianic Movement) is the name of a Christian movement comprising a number of streams, whose members may consider themselves Jewish. The movement originated in the 1960s and 1970s, and it blends elements of religious Jewish practice with evangelical Christianity. Messianic Judaism affirms Christian creeds such as the messiahship and divinity of "Yeshua" (the Hebrew name of Jesus) and the Triune Nature of God, while also adhering to some Jewish dietary laws and customs.

Esoteric Christians, such as The Christian Community, regard Christianity as a mystery religion and profess the existence and possession of certain esoteric doctrines or practices, hidden from the public and accessible only to a narrow circle of "enlightened", "initiated", or highly educated people.

Nondenominational Christianity or non-denominational Christianity consists of churches which typically distance themselves from the confessionalism or creedalism of other Christian communities by not formally aligning with a specific Christian denomination. Nondenominational Christianity first arose in the 18th century through the Stone-Campbell Restoration Movement, with followers organizing themselves as " Christians " and " Disciples of Christ ", but many typically adhere to evangelical Christianity.