Not once did it every workout for humans to decide on their own to do something and say it was for God. It is always a stench in His nostrils. This has ALWAYS been the problem, since Genesis we have wanted to do it "our way". Not because it's right but because it is easy, fun and it's what everyone else is doing. Every time He says: "DON'T DO AS THE PAGANS DO"
What' s the big deal about Fasting?
Go back and read Leviticus, the parts you skipped over, it’s ok, we all did it. Notice the detailed instruction and care about butchering and instructions about how to handle the blood.