Bingo!! Because we are not saved by keeping the law, because no one has ever kept it perfectly but Christ; hence, only through Christ by way of His sacrifice, are we saved. The practice of sacrificing animals was practiced EXACTLY for this purpose, as a foreshadowing statement that He would have to fulfill the law by way of His personal sacrifice on the cross. Again, those very practices were that shadow He fulfilled; and hence, we no longer practice those sacrificial laws.