The important topics covered in the "Sociology of Religion" section of Paper I are:

1. Definition and Nature of Religion:
This topic explores the various definitions and interpretations of religion, along with its characteristics, functions, and its role in society. It also analyzes the concepts of religiosity and spirituality.

2. Social Functions of Religion:
This section focuses on the sociological perspective of religion, examining its functions in society. It explores how religion provides social integration, social control, meaning and purpose, and social change. It also discusses the role of religious institutions in shaping social norms and values.

3. Religious Beliefs and Practices:
This topic delves into the study of religious beliefs, rituals, symbols, and myths. It explores the diversity of religious practices across different societies and cultures, and the significance of these practices in the lives of individuals and communities. It also analyzes the relationship between religious beliefs and social behavior.

4. Religious Organizations and Institutions:
This section examines the structure, organization, and functioning of religious institutions, such as churches, temples, mosques, and synagogues. It explores the roles of religious leaders and clergy, the hierarchy within religious organizations, and the influence of these institutions on society.

5. Secularization and Religious Revivalism:
This topic explores the phenomenon of secularization, which refers to the decline in the influence of religion in modern societies. It examines the factors contributing to secularization and the impact it has on individuals and society. It also discusses religious revivalism, which refers to the resurgence of religious beliefs and practices in response to secularization.

6. Social Stratification and Religion:
This section analyzes the relationship between religion and social stratification. It explores how religion can reinforce or challenge existing social inequalities based on factors such as class, caste, gender, and ethnicity. It also examines the role of religion in providing social mobility and addressing social injustices.

7. Religion and Social Change:
This topic explores the role of religion in bringing about social change. It examines religious movements and their impact on society, including religious reform movements, religious nationalism, and religious fundamentalism. It also discusses the relationship between religion and social movements.

In conclusion, the "Sociology of Religion" section of Paper I covers a wide range of topics, including the definition and nature of religion, social functions of religion, religious beliefs and practices, religious organizations and institutions, secularization and religious revivalism, social stratification and religion, and religion and social change. Studying these topics provides a comprehensive understanding of the sociological aspects of religion and its significance in society.