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Core branches
- Theology Proper: Study of the nature and attributes of God the Father
- Christology: Study of the person and work of Jesus Christ
- Pneumatology: Study of the Holy Spirit
- Bibliology: Study of the Bible: inspiration, authority, canon, and interpretation
- Theological Anthropology: Study of humanity from a biblical perspective, including creation and nature of man
- Hamartiology: Study of sin: its origin, nature, consequences
- Soteriology: Study of salvation: atonement, grace, faith, justification, regeneration, sanctification, glorification
- Ecclesiology: Study of the Church: its nature, offices, ordinances, and mission
- Eschatology: Study of last things: death, resurrection, judgment, heaven, hell, second coming, and eternal state
Secondary and supporting branches
- Angelology: Study of angels, their roles and ministries
- Demonology: Study of fallen angels, Satan, and demonic activity
- Missology: Study of the mission of the Church, especially evangelism and global missions
- Apologetics: Defense of the Christian faith through reasoned arguments and evidence
- Canonology: Study of the formation of the biblical canon: which books are Scripture and why
- Ethics (or Moral Theology): Study of Christian moral behavior, duties, and the moral implications of theology
- Patrology: Study of the Church Fathers and their theological writings
- Doxology: The theology of worship and praise, particularly how theology informs our worship of God
- Liturgiology: Study of public worship, including liturgical forms and sacramental theology
- Hermeneutics: Study of the principles and methods of biblical interpretation
- Covenant Theology / Federal Theology (or Dispensational Theology): Study of God’s covenants throughout Scripture and their implications for redemptive history
- Providence and Theodicy: Study of God’s governance of creation and the problem of evil
- Historical Theology: Study of how theology has developed throughout church history
- Practical Theology: Application of theology to pastoral ministry, discipleship, counseling, and daily Christian living
- Spiritual Theology: Study of spiritual formation and growth in holiness and Christlikeness
- Sacramentology / Ordinology: Study of the ordinances or sacraments, particularly baptism and the Lord’s Supper
- Cosmology (Biblical): Study of the created universe in light of Scripture (distinct from secular cosmology)