Before you judge too harshly, look at the first quotation again. All devout Christians believe in the transubstantiation of wine every time they take communion. Some people in different parts of the world just happen to take it a step further, by using real blood. In Kenya, Maasai warriors regularly consume cow’s blood mixed with its milk, but also drink it directly from the vein after a bloodletting.
When th Masai people of  Kenya are hungry and thirsty,they cut a cow's neck and collect the blood.
They blood is often mixed with fresh milk,a good source of carbohydrates and vitamins.They say it's a refreshing and healthy drink !