How did Mesopotamian religious beliefs change between the third and first millennia BCE?

Mesopotamian religious tradition was a consistent, coherent stream that evolved through internal development rather than external influence. Between the third and first millennia BCE, this evolution can be categorized into two primary stages:12

From Democratic Polity to Absolute Monarchy

During the 3rd millennium BCE, the divine realm was visualized as a "primitive democratic" polity where deities held specific offices and functions. By the 2nd and 1st millennia BCE, this structure shifted toward an absolute monarchical model. In this later stage, the religion became dominated by the god of the national state, reflecting the political emergence of Babylonia and Assyria as centralized national states.13

Emphasis on Personal Religion

A significant shift occurred in the 2nd and 1st millennia BCE toward a greater emphasis on personal religion. This period saw the development of deeper concepts regarding sin and forgiveness. Consequently, the relationship between the individual and the divine changed; the pious began to abstain from human initiative, placing absolute faith and reliance on divine intervention.1