Heb 9:22 And almost all things are by the law purged with blood; and without shedding of blood is no remission.
The reason why Adam and Eve were not destroyed when they sinned was because of "the Lamb slain from the foundation of the world." CHRIST was the sacrifice for the sins of Adam. When we understand what sin does we see that the sacrifice of animals could never remove the effects of sin. Only CHRIST's death could take accomplish this. The sacrifice of animals was intended to provide a graphic demonstration of the cost of sin.
My two cents.
Thanks for promoting GOD's original diet. Sure is better than what passes for nutrition in most American homes today. I've been a vegan (most of the time) for the past 24 years.