Satan believed he had a stronghold on humanity. He sought to kill, steal, and destroy. But Jesus was faithful and obedient and when humanity is faithful and obedient to God, He is victorious. It is not that God is reliant upon man or needs man to be victorious but He uses His creation to make himself known. And just as Satan has tried to use creation against God, God has in turn set apart His followers to be victorious over death and the evil that Satan unveils.