Genesis 1 is in the book of Genesis which is contained in the Old Testament. It tells the story of how God created everything in seven days, and how the world came into existence. Theogony on the other hand is an ancient Greek piece of literature written by a man named Hesiod. Theogony tells the story of how the world came into existence in regard to the ancient Greek gods. Both pieces of literature sound very different just by these descriptions, but what are these main differences between Genesis 1 and Theogony by Hesiod?
Genesis 1 like I stated above tells the story of how God created everything in seven days, and how the world came into existence. This telling explains what God created on each of those seven days: for example on the first day of creation God created light. This story in my opinion is quite organized and easy to understand; it clearly explains how everything was created by God.
Theogony on the other hand tells the story of how the world came into existence in regard to the ancient Greek gods. This story goes something like this: the world began in Chaos, which created earth. Earth, also known as Gaia goes on to create Heaven, and together they create the first gods, which in turn created more gods. This in turn created a very large, complex, and dramatic family of gods or deities.
The first main difference between these two stories is that of the creators. In Genesis there is only one creator, God, who created everything. In Theogony there were many creators involved, for example Chaos created earth, earth, Gaia created Heaven and the first of the Greek gods, and those Greek gods went on and created more gods. There is more than one creator involved in the story of Theogony, unlike the one creator in Genesis, God.
The second main difference is that of how the creators are portrayed. In Theogony the gods are portrayed with human emotions and behave in many ways like humans with supernatural abilities. God in Genesis is portrayed above this, and behaves as a sovereign God. Another key important difference is that to do with sovereignty. The Greek gods are not sovereign; they are not fully in control; they still are able to get tricked by other gods, to have conflicts with other gods, etc. God in Genesis is sovereign and is in control, which is very unlike the gods in Theogony.
Genesis 1 and Theogony are two unique stories that both contain the telling of a creation account. Both of these creation accounts are quite different; for example the creation account in Genesis 1 tells the story of how one sovereign God created everything in the course of seven days. The creation account in Theogony involves many creators, for example Chaos(which created earth or Gaia), Gaia(who created heaven), and they in turn created the first gods, who in turn created more gods. But regardless of the differences of both accounts I recommend reading both pieces of literature: Genesis and Theogony, especially Genesis.