The United Pentecostal Church International (UPCI) stands as a distinctive denomination within the broader landscape of Christianity, known for its adherence to Oneness Pentecostalism. Founded in 1945 through the merger of the Pentecostal Church, Incorporated (PCI) and the Pentecostal Assemblies of Jesus Christ (PAJC), the UPCI traces its theological heritage back to the early 20th-century Pentecostal movement, with roots extending to the Azusa Street Revival of 1906. Central to the beliefs of the UPCI is the concept of the oneness of God, rejecting the traditional Trinitarian doctrine in favor of modalism, also known as Sabellianism. This theological stance emphasizes that God manifests Himself in three modes—Father, Son, and Holy Spirit—rather than existing as three distinct persons. Additionally, Oneness Pentecostals advocate for baptism in the name of Jesus Christ alone, viewing it as essential for salvation, along with repentance, holy living, and the baptism of the Holy Spirit evidenced by speaking in tongues. These distinctive beliefs, coupled with adherence to strict holiness standards and a tendency toward separation from other Christian denominations, characterize the theological and cultural identity of the United Pentecostal Church International.