Human Blood is the medium of communication and exchange in the spirit world as far as God and man are concerned. Anything God intends to do for man demands blood. God cannot communicate with any man if he (man) doesn't give a sacrifice of his own blood at an altar which God dignifies. The theory of altars is what specifies how blood should be presented unto God. An altar is a place set by God on which all men should sacrifice their blood through their representative. The first Adam was the representative of all men but he failed the task of sacrificing his own blood upon the altar on behalf of all men. By the disobedience of Adam, human blood became the property of Satan who now transmits and distributes demons through it to oppress mankind. Jesus came as the second Adam to destroy the works of Satan by sacrificing Himself on the altar (Cross of Calvary) as the new representative of all men.