Orias, that is a long post and I don't really do those. All I can say is if you read Romans 4 and 5 it tells of how by Adam sin came on all men, and by Jesus it was paid for. In Hebrew it says that without the shedding of blood there is no remission of sins. There is allusion to that when God killed animals and made clothes for Adam and Eve after they sinned, and in the sacrifices of the OT which could never take away sins. But the sinless lamb without spot, Jesus, was able to do it. Isaiah 53 speaks of it as well. And it is hard for many people, even Christians to understand why and how this is so, but I believe God's Word rightly understood teaches this.
And from Jesus Christ...Unto him that loved us, and washed us from our sins in his own blood, Rev. 1:5
and the blood of Jesus Christ his Son cleanseth us from all sin. 1Jn 1:7b
Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold...But with the precious blood of Christ, as of a lamb without blemish and without spot: 1 Peter 18-19
Wherefore Jesus also, that he might sanctify the people with his own blood, suffered without the gate. Hebrews 13:12
In whom we have redemption through his blood, even the forgiveness of sins: Col 1:14
In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace; Eph 1:7
But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. Much more then, being now justified by his blood, we shall be saved from wrath through him. 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. Romans 5:8-10