Christianity was the state religion of Rome and, Zoroastrianism was the official religion of the Sassanids since the beginning of their empire in the 3rd century AD. The Zoroastrian church became very powerful, and its head, the mobadan mobad (or chief priest) , joined the military and bureaucratic leaders as one of the most important men in the empire. Zoroastrianism has similarities to Judeo-Christian theology. They believe in the disparity between good and evil, or light and darkness; the belief in angels and archangels; Satan as the epitome of evil and the adversary of God; the idea of paradise and hell; the idea of the continued existence of the soul past that of the body; reward and punishment by divine justice; the resurrection of the dead; the Last Judgment; beliefs in millennial periods and the end of the world; and the coming of a Saviour at the end of the world. Many of these ideas would also appear in Islamic theology. Zoroastrianism, which itself might have absorbed some of these ideas from Buddhism and Hinduism, was thus an important influence on several religions that followed it.