ABSTRACT
According to the doctrine of the Trinity, God the Father, God the Son, and God the Holy Ghost are three persons, but only one God. Christians, if they take the doctrine of the Trinity literally, believe that Christ is God. Hence the doctrine of the Trinity consists of a determined and ingenious attempt to have one's cake and eat it. Gottfried William Leibniz's well-known first law, the principle of the indiscernibility of identicals, is that if A and B have all their properties in common they must be identical. Leibniz's less well-known second law is that if A and B are numerically identical, they must have all their properties in common. Hence the possibility of Christianity being monotheistic must presuppose the erroneous doctrine of relative identity. If Christ just is God, everything true of Christ must also be true of God, and vice versa.
