10. God Is One in Three Persons

​While the Bible affirms that God is one (Mark 12:29; 1 Cor. 8:4-6), it also affirms that God exists as three Persons—Father, Son, and Spirit. Each Person of the Trinity is fully divine—the Father is God (John 6:27), the Son is God (Phil. 2), the Spirit is God (Acts 5:3-4)—and each Person is distinct from the others (Matt. 11:27; John 10:30; 14:16). T his perfect unity within the three Persons of the Trinity is a first-order doctrine; departing from it is to abandon orthodox Christianity.