I don't know anyone who atones for the prescribed sins per Leviticus, let alone follows such laws. It's banishment, animal sacrifice, and execution. There are all these weird types of sins, and key is not only sacrificing the right animal the right way for the right sin, but doing it in the Tabernacle, where the high priest and his family get to eat the sacrifice. Leviticus describes a legal-economic system regulated through religion centered around the tabernacle, with ownership and debts amortized across 49 year jubilee cycles. It's a grind of a book, most of describes the tabernacle and what animal to kill where and how its aroma does or does not please God, but its a pretty comprehensive code.
Genesis details the origins of The World, the People, and the Ancestors of Moses and the People of Israel etc. It proves God's power and and who wins and why. Exodus is kind of like, the same but instead of the birth of a world and a people its the birth of a nation and its unity. It shows how circumstance leads to Moses via God into leadership, and then actions to rules to a constitution of sorts and then more rules and laws. The end of Genesis and the beginning of Exodus is a pretty clear demarcation of prologue -> chapter 1. But Exodus bleeds into Leviticus pretty gradiently, the entire back 20 pages of Exodus could have been in Leviticus, or all of Leviticus in Exodus.