Prarthana Samaj was a religious reform movement that emerged in Bombay in 1867. It was founded by Keshav Chandra Sen, who was influenced by the Brahmo Samaj and the teachings of Ram Mohan Roy. The Prarthana Samaj believed in the spiritual equality of all castes and rejected the caste system.

Following are the reasons why Prarthana Samaj adhered to the tradition of Bhakti that believed in spiritual equality of all castes:

1. Bhakti Tradition: The Prarthana Samaj followed the Bhakti tradition, which emphasized the worship of a personal God and the importance of devotion and love in religious practice. This tradition rejected the caste system and emphasized the spiritual equality of all individuals.

2. Social Reform: The Prarthana Samaj was a reform movement that aimed to reform Hindu society and eliminate social evils such as caste discrimination, child marriage, and the oppression of women. They believed that all individuals, regardless of their caste, should have equal access to education, employment, and social opportunities.

3. Religious Pluralism: The Prarthana Samaj believed in religious pluralism and encouraged the study of different religions. They believed that all religions were valid paths to God and that individuals should be free to choose their own path of spiritual practice.

4. Emphasis on Education: The Prarthana Samaj emphasized the importance of education and established schools and colleges to provide education to all individuals, regardless of their caste. They believed that education was the key to social and economic progress and that it could help eliminate social inequalities.

5. Emphasis on Social Service: The Prarthana Samaj encouraged its members to engage in social service and to work for the betterment of society. They established hospitals, orphanages, and other charitable institutions to serve the needs of the community.

In conclusion, the Prarthana Samaj was a religious reform movement that adhered to the tradition of Bhakti that believed in spiritual equality of all castes. They rejected the caste system, emphasized the importance of education and social service, and encouraged religious pluralism.