All in the Name by Mark McNeil recounts his journey from a Baptist upbringing to involvement in the Oneness Pentecostal movement, where he embraced its emotional worship style and exclusivist beliefs. Oneness Pentecostalism teaches that speaking in tongues is necessary for salvation, baptism must be done solely "in the name of Jesus," Jesus is the Father manifested on earth (rejecting the Trinity), and the doctrine of the Trinity is a corruption of true biblical faith. Mark eventually left the movement through study, reflection, and spiritual guidance, ultimately converting to Catholicism. His story serves as both a personal testimony and a defense of orthodox Christian teachings on God, Jesus, and salvation.