Perhaps this will help you get started.
The study of Leviticus is not a particularly favored study by most people for a number of reasons. Most people do not like reading Leviticus because they see it as somewhat tedious. Others feel that because everything we see in this book is so far removed from our experiences, we simply have no point of reference to understand the book. Some feel there is nothing to be gained from such a study so, the book remains largely ignored and untouched in many circles.
Another reason this book is so despised by many is because of its instance upon a strict moral code, particularly regarding sexual orientation between men and women. Adultery and homosexuality are vehemently condemned and both carried the penalty of death. This is not acceptable to our present social conscience. For this reason, more than any other, the legitimacy and authority of this book has been challenged. The idea is that if one can delegitimize the book of Leviticus then the moral code it demands will no longer be valid.
Another reason some people do not invest time in the study of Leviticus, and other difficult books, is out of plain old-fashioned laziness. Most people do not want to be challenged intellectually and this is a book that requires a great deal of study and reflection as well as a good bit of research, and most people simply do not want to commit that kind of time.
Here are some of the objections given by people who neglect giving this book its due attention.
1. There seems to be no spiritual profit for us in the symbolisms and rituals of Leviticus. These rituals are senseless, elaborate, and useless for us today. In other words, Leviticus has no contemporary cultural relevance.
2. The laws found in Leviticus are extreme, arbitrary, and excessively severe. (By whose standard? This is man passing judgment on the word of God based on a human value system.)
3. There is no spiritual profit in the study of all the minute prescriptions of ether its religious or ceremonial nature. (Well, we'll see about that.)
4. The entire system seems childish and was incapable of even instructing Israel in moral and spiritual excellence. What value then can it have for us?
5. The whole of Leviticus seems almost below the dignity and majesty of God. I'm not sure I even know what to say to that.
6. There is no way we can understand this book today. It would take a Hebrew scholar and specialist just to interpret the book.
These excuses represent a pretty typical attitude of a great many people in the so called “Christian” community.