[Lukongsimi]

It doesn't make sense and you cannot explain why suddenly God must shed his own blood in order to forgive sins. 

Can you explain? No you cannot.

”For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh: how much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God? And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.“
‭‭Hebrews‬ ‭9‬:‭13‬-‭15‬ ‭KJV‬‬
https://bible.com/bible/1/heb.9.13-15.KJV