Why do civilizations develop religion?

Early civilizations were often unified by religion—a system of beliefs and behaviors that deal with the meaning of existence. As more and more people shared the same set of beliefs and practices, people who did not know each other could find common ground and build mutual trust and respect.

It was typical for politics and religion to be strongly connected. In some cases, political leaders also acted as religious leaders. In other cases, religious leaders were different from the political rulers but still worked to justify and support the power of the political leaders. In Ancient Egypt, for example, the kings—later called pharaohs—practiced divine kingship, claiming to be representatives, or even human incarnations, of gods.

Both political and religious organization helped to create and reinforce social hierarchies, which are clear distinctions in status between individual people and between different groups. Political leaders could make decisions that impacted entire societies, such as whether to go to war. Religious leaders gained special status since they alone could communicate between a society and its god or gods.

Explanation:

beliefs and behaviors that question the meaning of existence. political and religious organization helped to create and reinforce social ranks, which are clear distinctions in status between individual people and between different groups.

d. both had been uninhabited before settlers arrived.