Many scholars see the story of Tiamat as a story of the fall of the matriarchy to the patriarchy. Tiamat used to be a goddess, but in the Babylonian stories of her murder, she became a horrible monster whose body is dismembered and strewn about.
Tiamat was originally the goddess of the primordial sea, the mother of chaos and the formlessness from which everything takes shape. She held a very high position in the pantheon. But then later, stories emerge about her being a monster, and the logical, rational hero Marduk conquers her.
Her body is cut in half, one half becoming the sky, the other the land. Her tears become the rivers, her blood gives form to mankind.
This is a pattern repeated through several cultures, the demotion of goddess to monster or whore, and her death becomes the way for a world to take shape. Women represent chaos and disaster, men represent order.
"Marduk armed himself with a bow and arrows, a club, and lightning, and he went in search of Tiamat’s monstrous army. Rolling his thunder and storms in front him, he attacked, and Kingu’s battle plan soon disintegrated. Tiamat was left alone to fight Marduk, and she howled as they closed for battle. They struggled as Marduk caught her in his nets. When she opened her mouth to devour him, he filled it with the evil wind that served him. She could not close her mouth with his gale blasting in it, and he shot an arrow down her throat. It split her heart, and she was slain.”