From Adam until now, man has tried to make his own substitute. Man has constantly tried to do it, from fig leaves to education. He's tried to make himself a substitute. Adam expressed what was in man, when he tried to make his own way back by fig leaves. Since then, they've built towers, they've built cities, they've built idols, they've built civilization, they've built denomination, they've built scientific regimes, and all these things. But still it remains the same. Only Blood will God accept.
God only accepts a man through shed Blood.