Breaking down the question
The question has two demands. First, characterise the nature of religious change among tribal communities — its directions, drivers and consequences. Second, illustrate with two examples, one drawn from the colonial period and one from after independence. The instruction to periodise is explicit, so an answer that ignores the colonial/post-independence contrast will be capped.
The sociological core is that tribal religion — typically animistic, ancestor-oriented and tied to territory — has not remained static. It has changed along several axes: absorption into the Hindu fold through sanskritisation, conversion to Christianity under missionary influence, and the rise of internal revitalisation or reform movements that reassert a distinct tribal identity.
The note on tribes, integration and autonomy frames the wider debate about whether such change means assimilation or the loss of tribal distinctiveness.
How to approach it
Open by sketching the character of tribal religion and then set out the three main directions of change — Hinduisation, Christianisation and revitalisation — noting that these often coexist and compete. Make clear that religious change is rarely purely spiritual; it is entangled with economics, politics and identity.
Then deliver the two required illustrations. For the colonial period, missionary conversion among the tribes of the north-east or Chotanagpur works well. For the post-independence period, the sanskritising and reform movements, or state-sponsored integration, illustrate change under a democratic state. Conclude on the paradox that change can both erode and sharpen tribal identity.
Model answer
Tribal religion in its classic form is animistic and territorial — a worship of nature, spirits and ancestors bound to land, clan and locality, without the doctrinal apparatus of the great traditions. Yet contact with wider society has driven continuous religious change along three broad directions.
The directions of change. First, Hinduisation or sanskritisation — M. N. Srinivas's concept — by which tribes on the margins of Hindu society adopt Hindu deities, rituals, dietary norms and myths of origin, often claiming Kshatriya descent to raise their status. N. K. Bose described this absorptive process as the Hindu method of tribal absorption, whereby tribes are drawn into the caste order as distinct groups. Second, Christianisation, driven by missionary activity offering education, medicine and a new egalitarian identity. Third, internal revitalisation and reform movements that reassert a purified or distinct tribal religion against both Hindu and Christian encroachment.
Colonial illustration — missionary conversion. Under colonial rule, Christian missions were active among tribes such as the Khasi, Naga, Mizo and Garo of the north-east and the Oraon and Munda of Chotanagpur. Missionaries provided schooling, healthcare and script, and offered a religion that dignified the convert and released him from the ritual subordination he faced at the fringe of Hindu society. Conversion was thus as much social and educational as spiritual. It produced a literate tribal elite and, in the north-east, a strong link between Christianity and emergent tribal nationalism — religious change here consolidated rather than dissolved a separate identity. The Birsa Munda movement of the 1890s, though partly drawing on Christian and Hindu elements, is a colonial example of revitalisation: a charismatic reassertion of tribal religion and autonomy against missionaries, landlords and the colonial state at once.
Post-independence illustration — sanskritisation and reform. After independence, with the tribes drawn into a developmental state and closer contact with plains society, sanskritisation accelerated. Groups such as sections of the Bhils, Gonds and Meenas adopted Hindu deities, temple worship, vegetarianism and origin myths claiming higher-caste ancestry, seeking upward mobility within the wider society. Alongside this ran reform and revitalisation movements — the Tana Bhagat among the Oraon, and later assertions of distinct tribal religious identity such as the demand for recognition of Sarna and other indigenous faiths — which resisted absorption and insisted on a separate tribal religious category. K. S. Singh's surveys documented this simultaneous pull toward the Hindu fold and push toward a defended distinctiveness.
The nature of the change. Religious change among tribes is therefore multidirectional and identity-laden. It is not a simple erosion of tradition but a field of competing pressures — assimilation into Hinduism, conversion to Christianity, and internal reform — each carrying economic and political stakes. Crucially, the same process of change can either dilute tribal distinctiveness (sanskritisation folding tribes into caste society) or sharpen it (conversion and revitalisation crystallising a self-conscious tribal identity).
Examiner's perspective
The commonest failing is to treat religious change as a one-way slide into Hinduism or Christianity, missing the counter-current of revitalisation and the way conversion can strengthen separate identity. Examiners want the multidirectional picture and an awareness that religion here is entangled with land, education and politics.
Marks turn on obeying the periodisation instruction with genuinely distinct colonial and post-independence examples, and on deploying concepts — sanskritisation, the Hindu method of tribal absorption, revitalisation — rather than mere description. Citing Srinivas, Bose, Singh and a concrete movement such as Birsa Munda or the Tana Bhagat signals command of the tribal-society literature and secures the higher band.