The document discusses religion in the Indus Valley Civilization based on archaeological remains. It summarizes that the civilization likely had nature, fertility, and fire-based rituals centered around a mother goddess and Pashupati figure. Ritual aspects included figurines, seals depicting sacrifice, and elaborate burial practices. However, the lack of written texts means the philosophical aspects of their religion cannot be fully understood and interpretations are based on assumptions from material artifacts that show some regional variations.