The point is that God has appointed a blood sacrifice for the salvation of man. But those who like Cain reject God’s blood sacrifice, end up shedding innocent blood instead. Islam is a prime example of this. The only way we can be saved is through the blood of Jesus Christ, who died as a sacrifice for our sins.
The book of Hebrews goes into great detail in why the old covenant was just a stop gap , a temporary solution to man kind’s plight until God’s final solution came on the seen.
For the works based, flawed religious system and the institution of the old covenant ( in which though ? Was going to be done away with, yes works based salvation folks ? God said it him self in his own words,check it out for yourselves. ).
Anyway, had the old covenant worked and actually saved people and took away and cleaned their sins there would not been a need for a new one nor a savoir to come and save them.
Its funny what the works based salvation think that they are actually God and have the POWER to save them selves from their sins, AND ? Think they are God and the POWER of God to gives them selves eternal life’s, no wonder they are so prideful, so smug about them selves, and so self confident........ OPPS ! ..... I let the cat out of the bag on that one, well, the truth hurts.
I guess they are going to get mad like Cain and the Jahadist.