The reformed doctrine, taught in the Reformed Churches of PNG, is based on the Word of God alone. It is summarised below:
- We believe that the Bible is inspired by the Holy Spirit and is trustworthy and without error (infallible and inerrant) as the supreme authority in all matters of faith and lifestyle.
- We believe in the Holy Trinity. There is one God who exists eternally in three persons: the Father, the Son and the Holy Spirit.
- We believe in the universal sovereignty of God over all that He has made in heaven and on earth, including the spirit world, demons, sorcery, sanguma and all other forms of witchcraft. And that He rules over all things for the purpose of His church.
- We believe that God created man good, but because of the fall into sin men became dead in their sins and are totally unable to save themselves from God’s wrath against sin.
- We believe that from out of all the peoples of this world, God has chosen to save a people for Himself. This choice of God is made only by His good pleasure through Christ’s work and not according to who we are or what we have done.
- We believe that Jesus Christ is the eternal Son of God, and His work was so complete that all who were chosen to eternal life will be saved.
- We believe that salvation is only possible through true faith in Jesus Christ, who took our place and received our penalty for sin.
- We believe the chief work of the Holy Spirit is to work repentance and faith in the hearts of sinners through the Word of God and bind them to Christ in order to live a new life with Him.
- We believe there is one holy and universal church and all believers and their children on account of God’s covenant are called to be members of that church.
- We believe that Jesus Christ is now in heaven, at the right hand of God the Father, and on the last day will return to judge the living and the dead. All who are declared righteous by faith will live with Him, in glory, forever, but the wicked will perish eternally in hell.
- We believe that all aspects of our lives are to be lived to the glory of God under the Lordship of Jesus Christ.