If you read only for instructions for such as animal sacrifice that is now obsolete, or the 613 laws that are mostly obsolete with the temple replaced, and ignore what is said about the legalistic obedience and the spirit of the law then you certainly are missing most of scripture. With that mindset you are missing most of what God is teaching in both the OT and NT, so you simply have what you create in your own mind, with nothing to do with understanding the Lord as either testament teaches.Well, I'm not planning on sacrificing any bullocks on the alter, throwing away my multifabric pants, giving up sausage with my breakfast, offering turtledoves for my newborn, or shaving off my goatee to be saved. Am I in trouble with God for these things?
If you listened to the Lord as you read scripture you would find that everything, including what the Lord tells you about the obsolete animal sacrifice, teaches you something eternal about God. Christ does every single thing scripture tells us that animal sacrifice did, except Christ does it better, more completely, and His one death is complete for all sacrifice.