Oneness Pentecostalism
Oneness Pentecostalism teaches that God is one person who reveals Himself as Father, Son, and Holy Spirit, and that the new birth requires baptism in Jesus' name and speaking in tongues, reviving ancient modalism and adding conditions to the Gospel of grace.
The lesson walks through the topic one card at a time. The full study is the complete written article, with its sources.
How Oneness Pentecostalism arose in the New Issue of 1913–1916, and how it revives ancient modalism
What Oneness teachers say about God, Jesus, salvation, and authority, in their own words
How Scripture shows the eternal Son with the Father, and how it answers the main Oneness proof texts
Why salvation does not depend on a baptismal formula or on tongues, and how to share the Gospel with a Oneness friend