Oneness Pentecostal

Oneness Pentecostalism (also known as Apostolic or Jesus' Name Pentecostalism and often pejoratively referred to as the "Jesus Only" movement in its early days) is a category of denominations and believers within Pentecostalism which adhere to the nontrinitarian theological doctrine of Oneness. The movement first emerged in America around 1914 as the result of doctrinal disputes within the nascent Pentecostal movement and claims an estimated 24 million adherents today. For a list of denominations in this movement, see List of Christian denominations.

Oneness Pentecostalism derives its distinctive name from its teaching on the Godhead, which is popularly referred to as the Oneness doctrine. This doctrine states that there is one God, a singular divine Spirit, who manifests himself in many ways, including as Father, Son, and Holy Ghost (the Holy Spirit). This stands in sharp contrast to the doctrine of three distinct and eternal persons posited by Trinitarian theology. Oneness is similar to Sabellianism (also referred to as modalism, modalistic monarchianism, modal monarchism, or Patripassianism). Oneness believers baptize in the name of Jesus Christ, commonly referred to as Jesus-name baptism, rather than using the Trinitarian formula.

Besides their beliefs about the Godhead, Oneness Pentecostals differ significantly from most other Pentecostal and Evangelical Christians in matters of soteriology. Whereas most Pentecostals and evangelicals believe that only faith in Jesus Christ and repentance from sin are essential elements for salvation, Oneness Pentecostalism defines salvation as repentance, baptism (in Jesus' name) and receipt of a holy spirit, with the evidence of speaking in other tongues. They also tend to emphasize strict "holiness standards" in dress, grooming and other areas of personal conduct that are not necessarily shared by other Pentecostal groups, at least not to the degree that is generally found in Oneness churches.

...
Wikipedia