Genesis 9:5

Surely for your lifeblood I will demand a reckoning; from the hand of every beast I will require it, and from the hand of man. From the hand of every man’s brother I will require the life of man. (Genesis 9:5 NKJV)

God demands a reckoning of Noah. So far, Noah has not been described in a wicked way. H is found righteous and faithful, so why demand a reckoning? Noah is from the linage of Adam and is born a sinner. Now Noah sacrificed the clean animals to God, which means thar he was aware of what God wanted, and acted in that knowledge. But we don't have to sacrifice animals because Jesus is that reckoning that god demanded. His blood was spilled for us. We are righteous because we know that He died for us and accept His lifeblood on our behalf.