Long before the first Hebrew Temple, before the bith of Christ and the Mission of Muhammad, Zarathustra had taught of a single universal god; of the Battle between Good and Evil, the coming of a saviour and the end of the world.

"If O mortals, you shall hearken diligently unto these commandments which Mazda has commanded you, of happiness and pain, long punishment for the followers of Druj, and blessings for the followers of Asa, then hereafter all shall be well..."
Zarathustra