Have you ever tried to read the Bible all the way through? Many have told me that they TRIED at one time or another, but never were able to finish. They did fine getting through Genesis and the great stories of Abraham, Isaac, Jacob, and Joseph. Exodus was not bad, especially the first half with the stories of Moses and the escape from slavery in Egypt. But the book of Leviticus proved to be a bit much - all those ancient rules and regulations, instructions for priests, directions for sacrifices, dietary laws and so on got to be like wading in molasses. Finally, the high resolve of reading the whole Bible through was abandoned as an impossible job.
There is no question that a good bit of Leviticus does not have much to say to modern Christians (which is the reason you hear so little preach…