Offerings or Awful things?

Throughout The Old Testament there are various scriptures illustrating how God asked for sacred offerings from His people. What made those offerings sacred? What was it about the lamb, the ram, or the bullock? Did the animal have to have a certain hair color, shape, size? I mean what REALLY made the offering sacred? Why did God ask them to sacrifice these animals? Then we skip to The New Testament when God is revealed in flesh through His Son, Jesus Christ, as The Ultimate Sacrifice for the sins of the world. For He said, "If any man come after me he must first deny himself, pick up his cross, and follow Me..."-Sacrifice.  As it is written, "Jesus when He had cried again with a loud voice yielded up the ghost."-Sacrifice! For God so loved the world that He gave His Only begotten Son so that anyone who believes on Him shall not perish , but inherit Eternal Life."-Sacrifice. So to answer those previous questions, God does not want our things or money; He wants our hearts. Abel gave to God from his heart. Cain gave from his flesh and that is why his offering was not pleasing to God. Judas followed Jesus but never offered his heart to Him. Therefore he did not enter the kingdom of God. How would you feel to verbally claim and "act" as though you are a follower of Christ as Judas did and be denied inheritance of His Kingdom once your judgment comes? No one likes a fake individual, so why do we fake Christianity? Since Jesus has given His Life we are not asked to sacrifice a bullock for an offering, but to offer our lives as a usable tool for God which was all He wanted since the beginning. I mean who wants someone to give them something with strings attached? That's how we do God sometimes. Okay Lord, I'll give you a section of my life, but I still want to have sex, drink excessively, go to wild parties, watch porn, use profanity, etc...not saying once saved those bad habits will magically vanish the first day of conversion, but there should be a genuine intent to strive to please God. Also there is no money we can pay or number of church services we can attend to get right with God. "...For we are not saved by works lest any man shall boast." it goes back to the heart. He wants it ALL, not a portion, not partial, ALL! He wants to clean us up, renew us each day so that we will become better, inspirational, and that His Light can shine brighter in someone else life through us so that He can draw others to Him.
                                                                         Prayer

https://youtube.googleapis.com/v/dUMRqJCV9Q4&source=uds

                                    Lord thank You for Your limitless Love that was perfectly displayed on The Cross for the sake of my soul! Forgive me! Help me to be a living sacrifice so that Your Light may attract others. Search me and clean me as You see fit. I want to be used by You, in Jesus name, Thank You Lord, Amen!
Study Scriptures: Genesis 4, Numbers 28, Matthew 16:24, Matt. 27:50, John 3:16, Romans 12:1, Eph. 2:1-10