So what the fuck was leviticus about then? The bible is a religious text with some practical advice on physical mechanisms, like what to eat to be healthy, or what kind of clothes to wear. To ignore that fact about religion is retarded.
Religion and mysticism were man's first attempt to understand the world and science is a refined approach at the same thing. There is no magic dividing line between the two. Oh wait, yes there is; evidence, science requires it, religion does not.