The Nature of God and the Trinity
Who Is God? The Christian Understanding
Christianity teaches that God is not simply a powerful being among others, but the ultimate reality behind all existence. Christians believe in one God who is both the source of all things and the sustaining power that keeps the universe in being. Understanding God’s nature is the foundation of all Christian belief — it shapes how Christians worship, how they make moral decisions, and how they understand their own lives.
God as Creator and Sustainer
The opening chapter of the Bible declares that God is the creator of everything. Genesis 1:1–3 describes God bringing the universe into existence through his spoken word: light, sky, land, and life all come from his creative command. Christians understand this as creation ex nihilo — creation out of nothing. God is not simply a craftsman shaping existing material; he is the reason there is anything at all.
God is also sustainer of the universe, meaning he does not step back after creating. Christians believe that the world depends on God’s ongoing power to exist at every moment. Without God’s sustaining presence, creation would simply cease to be.
Genesis 1:1–3 teaches that God created the universe from nothing (ex nihilo) through his word alone. This makes God the source of all existence, not just the shaper of existing matter.
The Four ‘Omni’ Attributes
Christians use four key terms to describe God’s unique nature, each beginning with the Latin prefix ‘omni’ (meaning ‘all’):
Omnipotence — omnipotence means God is all-powerful. Christians believe nothing is impossible for God. The creation account demonstrates this: God creates simply by speaking. This does not mean God can do logically impossible things (such as making a square circle), but no physical or moral obstacle limits him.
Omnibenevolence — omnibenevolence means God is all-loving. Christians believe that everything God does flows from perfect love. The parable of the prodigal son (Luke 15:11–32) illustrates this: the father runs to welcome back his wayward child before he can even apologise, showing a love that does not calculate or hold back.
Omniscience — omniscience means God is all-knowing. Nothing is hidden from God. Christians find this both comforting (God understands them completely) and challenging (there are no secrets before God).
Omnipresence — omnipresence means God is present everywhere simultaneously. Christians do not believe God is physically located in one place but that there is no location where God is absent. This makes genuine prayer possible anywhere, not just inside a church building.
The four omni- attributes are: omnipotence (all-powerful), omnibenevolence (all-loving), omniscience (all-knowing) and omnipresence (present everywhere). These describe a God who is infinite in power, goodness, knowledge and presence.
The Nature of Humanity: Image of God
According to Genesis 1:26–27, God created human beings in his own image of God (the Latin term is imago Dei). This teaching has important implications. If every person is made in God’s image, then every human life has an inherent dignity that cannot be taken away by poverty, failure or sin. Christians also understand that being made in God’s image means humans are moral, rational and creative beings — capable of love, reason and meaningful relationship.
However, Christians also believe in the fall — the idea that human beings, through disobedience to God (Genesis 2:15–17, 3:1–24), have become morally damaged. Humans still bear the image of God, but it is distorted by sin. This ‘fallen’ nature explains the presence of evil and suffering in the world and points towards the need for redemption through Jesus.
The Trinity: One God, Three Persons
Christianity’s most distinctive belief is the Trinity. Christians believe in one God, but that this one God exists as three distinct persons — Father, Son and Holy Spirit — who share the same divine nature equally. The Trinity is not three separate gods (that would be polytheism), nor is it one God wearing three different masks (that heresy is called modalism). Rather, each person of the Trinity is fully God, and yet there is only one God.
The Trinity is not directly stated in a single Bible verse, but Christians draw it from the overall witness of scripture:
The Father is most fully revealed in Luke 15:11–32, the parable of the prodigal son, where God’s character as a loving, forgiving parent is illustrated. The father does not wait for his son to grovel but runs to embrace him — a picture of unconditional divine love.
The Son is described in John 1:1–3 and 1:14 as the eternal Word (Greek: Logos) who existed before creation and through whom all things were made. The Word ‘became flesh’ in the person of Jesus of Nazareth — this is the Incarnation. Jesus is both fully divine and fully human.
The Holy Spirit is spoken of in John 14:25–26, where Jesus promises to send the Spirit as advocate and teacher who will remind his followers of everything he taught. In Galatians 5:22–23, Paul describes the ‘fruit of the Spirit’ — love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control — as evidence of the Spirit’s transforming work in believers’ lives.
Why the Trinity Matters in Practice
The doctrine of the Trinity shapes Christian life at every level. Baptism is performed ‘in the name of the Father and of the Son and of the Holy Spirit’ (Matthew 28:19). Many prayers end ‘through Christ, in the Spirit, to the Father.’ Worship addresses all three persons. Christians disagree about some details of Trinitarian theology — Catholic, Orthodox and most Protestant traditions affirm it fully, while Jehovah’s Witnesses and some other groups do not accept it — but the majority of Christians worldwide regard belief in the Trinity as central to authentic Christianity.
The Trinity also provides a model for human relationships. If God himself exists in perfect community — as three persons in loving relationship — then human beings, made in God’s image, are fundamentally relational too. Isolation and self-sufficiency contradict the Trinitarian model; love and mutual dependence reflect it.