To deny the literalness of the necessity of the shedding of Christ's blood is IMO a serious error.
The necessity of the bloodshedding is indeed shown in the OT.
Leviticus 17
11 For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.
12 Therefore I said unto the children of Israel, No soul of you shall eat blood, neither shall any stranger that sojourneth among you eat blood.
13 And whatsoever man there be of the children of Israel, or of the strangers that sojourn among you, which hunteth and catcheth any beast or fowl that may be eaten; he shall even pour out the blood thereof, and cover it with dust.
14 For it is the life of all flesh; the blood of it is for the life thereof: therefore I said unto the children of Israel, Ye shall eat the blood of no manner of flesh: for the life of all flesh is the blood thereof: whosoever eateth it shall be cut off.
We cannot live forever with the mortal life of oxygenated blood flowing through our veins and arteries.
Romans 5
8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
9 Much more then, being now justified by his blood, we shall be saved from wrath through him.
10 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
Christ made the exchange for us. Mortal (subject to death because of sin) life based upon blood versus eternal life of the Spirit as the life force.
He "undid" what Adam had done to his race.
As the new Adam He offers this life based upon the exchange of mortal (subject to death because of sin) life for the eternal life of the Spirit by which He Himself now lives having been put to death in the flesh but made alive by the Spirit.
Romans 8
10 And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
John 5:24 Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
This is why it was not possible for the blood of bulls and goats to take away sin as they are dumb creatures and have no intrinsic power whatsoever to give life but were a shadow of things to come being now justified by His blood, power and authority.
Revelation 1:18 I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
HankD
It is crucial! The denial that the shedding of Christ's blood is a complete repudiation of the gospel of Jesus Christ as there is no remission of sins without the shedding of Christ's blood.