1. Early Christianity: The study of the origins and development of Christianity in the first few centuries after the death of Jesus.
2. Medieval Christianity: The study of Christianity during the Middle Ages, including the rise of the Catholic Church, the spread of Christianity in Europe, and the influence of Christianity on society and culture.
3. Reformation and Counter-Reformation: The study of the Protestant Reformation and the Catholic Counter-Reformation in the 16th century, including the theological, political, and social changes that occurred during this period.
4. Modern Christianity: The study of Christianity in the modern era, including the impact of colonialism, globalization, and secularization on the practice and beliefs of Christians around the world.
5. Missionary History: The study of the spread of Christianity through missionary work, including the efforts of individual missionaries, missionary organizations, and the impact of missionary activity on indigenous cultures.
6. Ecumenical Movement: The study of efforts to promote unity and cooperation among different Christian denominations, including the history of ecumenical councils, dialogues, and agreements.
7. Women's History of Christianity: The study of the role of women in the history of Christianity, including their contributions to theology, ministry, and social justice movements.
8. African American Religious History: The study of the history of Christianity among African Americans, including the development of African American churches, the role of Christianity in the civil rights movement, and the influence of African American religious leaders.
9. Global Christianity: The study of Christianity as a global religion, including the growth of Christianity in non-Western countries, the impact of globalization on Christian communities, and the diversity of Christian beliefs and practices around the world.