Pluralistic Bengali society experienced religious encountering from time immemorial. This encountering resulted in amalgamation and syncreticism that was a threat to the individual identity of every religion generally and Hinduism particularly. In the course of history, many reform movements were launched by Hindus and among these one is BrahmoSamaj that was a socio-religious reform movement. The founder of this movement was Ram Mohan Roy, who is called the father of socio-religious reform movements of nineteen century Bengal. On one hand, he incorporates the ideas of Muslim Sufis, western scientific look, utilitarian and deistic thought for his socio-religious reform program, on the other hand, from Hindu philosophical schools, he adopted the Advaita Vedanta of Shankaracharya. In the Ram Mohan’s selections of Advaita Vedanta the influence of Orientalist and Christian Missionaries can not be ignored. That facilitates him to design his neo-Vedanta which in its basis shares the concept of formless one God of ShankaracharyaAdvaita Vedanta. But it deviates from classical Advaita Vedanta in shifting of authority from Vedas to Upanishad, abandoning of idol worship, caste system, polygamy (kulinism) and widow burning. Because Shankar’s Advaita Vedanta accepts all these Hindu socio-religious duties as part of his dharma.