There are thousands of proofs to show that God is one but the commonest and the clearest of them all is that every thing in the world has a circular shape and the circular shape indicates the oneness of God. The drop of the water is circular and so is the earth (it is round). The flame of the fire is circular and so also is the shape of the stars. Had trinity been the correct dogma, these things should have been triangular – having three corners.
God the Almighty started humanity with Adam and ended it with another Adam. The Messiah who was promised was named Adam, by God. Since this second Adam is of a new type, the battle to be fought against Adam is also of a new type.