The people of Mesopotamia practiced a polytheistic religion, worshipping a pantheon of gods and goddesses associated with natural elements, city-states, and various aspects of life and fertility. Major deities included Anu (the sky god), Enlil (the air and storm god), and Inanna (the goddess of love and war), among many others. Religious practices involved rituals, offerings, and temples dedicated to these deities, with each city-state often having its own patron god.
In Ancient Egypt, the religion was also polytheistic, with a rich array of gods and goddesses such as Ra (the sun god), Osiris (the god of the afterlife), and Isis (the goddess of motherhood and magic). The Egyptians placed a strong emphasis on the afterlife, leading to elaborate burial practices and the belief in an eternal existence after death.
Other religions that emerged in Mesopotamia and Ancient Egypt included various local cults and sects that may have worshipped specific deities or spirits. Over time, particularly with influences from surrounding cultures and historical events (like the conquests by different empires), syncretism occurred, blending elements of these religions. Additionally, during the later periods, the influence of Zoroastrianism from Persia began to seep into Mesopotamia, while in Egypt, Christianity emerged in the first few centuries CE, becoming dominant by the late antiquity period.
In summary, the major religions in both Mesopotamia and Ancient Egypt were characterized by polytheism, but varying local practices and beliefs, as well as later religious developments, contributed to a rich religious landscape in both regions.