Since man originally committed the first sin, sacrifice for our sins was necessary before God. Man sacrificed animals to shed their blood for our sins, but it was never enough! God knew that it was never going to be enough to do these things so he sent his Son to pay the price for our sins on the Cross at Calvary. That whosoever would accepted this as the price paid for our sins, would be justified before God. That we might become sons and daughters of the Most High God.
John 3:14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: 3:15 That whosoever believeth in him should not perish, but have eternal life. 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 3:17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 3:18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Isiah 53:2 For he shall grow up before him as a tender plant, and as a root out of a dry ground: he hath no form nor comeliness; and when we shall see him, there is no beauty that we should desire him. 53:3 He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. 53:4: Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted. 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. 53:6: All we like sheep have gone astray; we have turned every one to his own way; and the Lord hath laid on him the iniquity of us all. 53:7 He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. 53:8: He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken. 53:9: And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. 53:10: Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand.
Jesus was that sacrifice that was acceptable to God. Believe on the Lord Jesus Christ and be saved. Romans 10:11 For the scripture saith, Whosoever believeth on him shall not be ashamed. 10:12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him. 10:13 For whosoever shall call upon the name of the Lord shall be saved.