Despite a long and sustained history of Christian missionary activity in India, the Christian population remains remarkably small. According to the 2011 Census, Christians constitute only 2.3% of India's total population. This figure appears disproportionately low when considering the continuous missionary presence, which began with the arrival of the Portuguese in the 15th century and continued through the British colonial era. While missionaries played a significant role in spreading Christianity across various regions, their overall success in converting the Indian population remained limited. This raises a crucial question: Why have Christian missionary efforts not resulted in a higher conversion rate, especially when compared to the more widespread influence of other religious and cultural movements in India? One possible explanation lies in the enduring strength and resilience of Hindu religious and cultural traditions. Hinduism, with its deep philosophical roots, diverse spiritual practices, and strong social structures, provided an inherent resistance to conversion. The caste system further influenced conversion patterns, as upper-caste Hindus largely resisted Christianity due to concerns over losing their social status, while lower-caste communities saw conversion as a potential means of social mobility. Additionally, the Bhakti and Hindu reform movements of the 19th and 20th centuries reinforced Hindu traditions and addressed social injustices, reducing the appeal of Christianity. Another critical factor was the long period of British colonial rule, which led many Indians to associate Christian missionaries with imperialism. Missionaries were often perceived as cultural agents of colonial domination rather than as purely religious figures, leading to resistance against their efforts. Furthermore, socio-economic factors, including regionalism and the presence of indigenous religious traditions, added further complexity to missionary work. This paper aims to analyse these historical, sociological, and political factors to provide a comprehensive understanding of the challenges faced by Christian missionaries in India.