Blood is associated with dead animals, not plants.
Muscle,fat and organ meat were hard to come by and valuable the old hunter/gatherer days.
Getting others to give you meat would be a scam that benefited you and your family (e.g. the Levites.)
Having a magic threat kept the animal sacrifices coming (you can eat them the day after they are
offered to the Gods if They don't take them and somehow, They never do.)
Muscle,fat and organ meat were hard to come by and valuable the old hunter/gatherer days.
Getting others to give you meat would be a scam that benefited you and your family (e.g. the Levites.)
Having a magic threat kept the animal sacrifices coming (you can eat them the day after they are
offered to the Gods if They don't take them and somehow, They never do.)
So how, exactly, does God know that She's NOT a brain in a vat? 
