Current research in northeast India and the Himalayan regions has contributed to a new understanding of history by integrating non-human beings and elements of the landscape. In doing so, it responds to epistemic and ontological shifts brought about by the environmental humanities. These new research approaches are giving rise to fresh interdisciplinary questions and alliances that are also recalibrating the well-established field of "ecology and religion". Indigenous cosmologies and narratives are expanding the repertoire of classical naturalistic, European philosophical imagination and inviting a reconsideration of current discussions about new materialisms and multi-species research. This paper presents the results of a series of workshops with universities in northeast India and the interdisciplinary dialogue that has developed from them. It presents some of the more recent discussions and examines the challenges and opportunities these discussions hold for religion-related research. The focus is on the construction of Indigenous religion in northeast India in narratives, stories, and cosmologies and their relationship to global discourses. Particularly, it examines the role of forests as ecological assemblages and tapestries of various human and more-than-human actors. In doing so, it presents the religious and collective imagination of agency beyond humans. The paper argues for a shift in emphasis from global to planetary religious history, thus following the call for the decolonization of nature in the Asian highlands. The programmatic demand of moving from global South and North toward a planetary South and North is taken up, and the question is asked to what extent researchers in the planetary North can become allies and participate in the decolonization of environmental history and religion.