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Theology
The study of the nature of God and religious belief.
Apostolic Fathers
Early Christian writers who are believed to have known the apostles or their close associates.
Gnosticism
An ancient belief system that posits gnosis, or secret knowledge, as the path to salvation.
Marcionism
A heretical belief system that rejected the Old Testament and presented a different version of Christianity.
Nicene Creed
A statement of Christian faith established at the Council of Nicaea that affirms the Trinity.
Ecumenical Council
Gathering of Christian leaders and theologians to discuss and settle questions of doctrine.
Sacraments
Rituals instituted by Christ, such as baptism and Eucharist, as means of grace.
Apocrypha
Books excluded from the canonical Bible, often due to questions of authenticity or authority.
Pneumatology
The study of the Holy Spirit and its role in the Christian faith.
Christology
The branch of theology relating to the person, nature, and role of Christ.