- Christianity
- Christians: Numbers, Growth, Demography
- Early Christian Councils
- Early Christian and Christian-like Sects:Thomasines, Ascetics and Manicheism
- Gnostics: Their History and Impact on Christianity
- Gnostic Beliefs and Texts
- Copts and the Coptic Church in Egypt
- Nestorians
- Christians in the Middle East
- Assyrian Christians, Chaldeans and Jacobites
- Maronite Catholics
- Catholic-Orthodox Split: Friction, Disputes, Iconoclasm
- Heretics — Cathars and Waldensians — and Their History and Deaths
