22 Indeed, under the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness of sins. ~ Hebrews 9:22
The blood couldn’t be just any blood, though. It had to be the blood of an innocent sacrifice. Therefore, no ordinary human sacrifice would do. Because everyone, even a newborn baby, is born with the sin nature, having the knowledge of good and evil. So, God had to find two innocent animals to sacrifice. Now, one would think that that would be good enough, and no more sacrifice would be needed, but that is not the case. The problem with that is the blood of an innocent animal could only roll the sins ahead, or in other words, it could only temporarily put off judgment.
Only the blood of our Kinsman Redeemer could purify us from all unrighteousness and cleanse us from our sins. Jesus is our Kinsman Redeemer. He is our only Savior. He paid our debt for us on the cross. He didn’t come to earth as an angel, a Beast of the Field, or an animal. Jesus came as a baby. He came in the image of man. Jesus took on our form so that He could save us through Him. So that He could take our place, forgive our sin, and blot out our sins.
There is nothing that you could ever do to earn forgiveness. Your debt was already paid. All you have to do is accept His free gift of Salvation through confessing Jesus as LORD and repenting.