God sacrificed an animal to make Adam and Eve coats of skin.  After they were banished from the garden, God began to prepare a plan to sacrifice himself to cover our sin.  Without the shedding of blood there is no remission of sin.  Matthew 26:28  puts it this way:  (Christ is speaking),  "For this is my blood of the new testament, which is shed for many for the remission of sins."

Heb.  9:22,  puts it this way:  "And almost all things are by the law purged with blood; and without shedding of blood is no remission."  You don't hear much from the pulpit anymore about blood.  It isn't very popular.

I was going through an old hymnal the other day, and was surprised by the number of hymns that were composed about the blood of Christ.  "Power in the Blood",  for example.  I personally have not heard a religious song about the Blood of Christ in many, many years.

In Acts 2:38 the Gospel is defined:  "...Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and you shall receive the gift of the Holy Ghost."  In other words, God will put his Spirit back into you--where he wanted it to be in the first place.

Paul says in Rom. 3:25 "Whom (Jesus) God has set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins...".

You just can't have the gospel without the blood of Christ.