Because quotations are used to mark claims from other people. Using other people’s claims can help validate your own.
The school system that’s what it is
The Sumerian religion was majorly practices by the people of Sumer. The sumers were the first literate civilization of Mesopotamia. They had a strong belief that the universe that had been formed is due to a series of cosmic births. Their deities included Enlil, Utu, Enki etc.
Whereas the Mayans believed in several aspects of rituals, astronomy and nature. They were known for their religious calendars. Their deities mainly were nature Gods like the Sun , Moon, Corn/Maize, Rains, etc.
They mostly developed because men did most of the work. Agrarian societies required hard work and toiling out in the field while pastoralism required people to take care of numerous animals at once and these animals often needed human strength and speed. Thanks to this, men were the ones who did those jobs and since they were valued more than taking care of the household, gender inequality originated.