Wrong. :)
The offering made in Genesis 4:3,4 and 5 are BLOODLESS.
The bloody ones come along in Leviticus. As mentioned above. If they were bound and determined to continue in the heathen ways of their exile, they were at least given a temporary means of doing so.
Genesis 31:53
Jacob promised, swearing by the Fear, the God of his father Isaac. Then Jacob offered a sacrifice on the mountain and worshiped, calling in all his family members to the meal. They ate and slept that night on the mountain. Laban got up early the next morning, kissed his grandchildren and his daughters, blessed them, and then set off for home.