Christian ethical imagination was always tempered by various social prejudices prevalent in local contexts. Particularly during modernity and subsequently through colonial expansion, the role of race and caste became central to the expansion of Christianity through missionary activity. A closer scrutiny of colonial missionary Christianity clearly suggests the significance of racialised worldview shaping theological and ethical paradigms. In particular contexts, such racialised imagination underpinned and gave credence to other forms of social prejudices, such as caste in South Asia. Through a post-colonial lens, I examine the role of race and caste in shaping Christian ethical frameworks and articulate the rationale for ‘decolonising’ the modern foundations of Christian ethics in pursuit of racial justice in our contemporary society.