From Wikipedia, the free encyclopedia: "The United Pentecostal Church International (UPCI) is a Pentecostal Christian denomination, headquartered in the St. Louis suburb of Hazelwood, Missouri.[1] It is a part of the Oneness or "Apostolic" portion of the Pentecostal Movement, and was formed in 1945 by a merger of the former Pentecostal Church, Incorporated and the Pentecostal Assemblies of Jesus Christ. This church is especially distinguished by its adherence to Oneness theology, its use of baptism in Jesus' name (as opposed to the Trinitarian formula), and an emphasis upon Holiness living in all aspects of one's life."