No one is named as the author of Genesis, but we hold to the idea that Moses is the author of the first five books of the Bible. Let’s talk about how we came to that assumption. Many people refer to the first five books as the Torah or the Pentateuch. The theme of Genesis is origins. Where did the heavens and earth come from? What about the origin of man and sin? This is all discussed in Genesis, the foundation on which the other books of the Bible are built.