Since Genesis 3:15 predicted Jesus’ victory over Satan at the cross, Cain and Abel must have understood the need for sacrifices. Their sacrifices appear to be sacrifices for their own sin. The Offeringsīut the sacrifices of Cain and Abel were very different. Since Jesus was the perfect sacrifice, there is not a need for any more sacrifices to be made. He made the last sacrifice too! The last sacrifice was Jesus Christ who died for our sins. I believe that God did this for Adam’s and Eve’s sins. This implies that God actually made the first sacrifice. The LORD God made garments of skin for Adam and his wife, and clothed them. The clothes God gave then were made out of animal skins. You are correct that God provided Adam and Eve with some clothes to wear. Let’s examine the scriptures to see why God was not pleased with what Cain offered. When Cain brought his sacrifice to God, he had worked to produce what he brought.

I wonder why Cain didn't trade Abel crops for livestock? Bible Answer:

Farming back then must have been very hard.

It would seem that Cain worked harder to produce the sacrifice he offered to God than Abel did. God's choice of sacrifice to cover Adam and Eve's sin was a blood sacrifice to cover their shame. I thought God was not pleased with Cain's sacrifice because it was not an animal there was no blood involved.

Cain and abel offering