Rome and Greece were still pagan...
Rome and Greece were still pagan, the Christian creed emanated from the welding of the monastic Christianity with the pagan cult of Rome, effected by King Constantine of Rome, after about 300 years after the departure of Jesus was still ignorant of the elementary knowledge about the world. Its knowledge even about the earth was childish for even centuries later it had yet to pelt stones on Columbus when he told them that the earth was round.
This was the state of Europe when Islam had already preached the truth about the Universe as a whole; the truth which even to this day is the highest and the modern scientists with all their claims of wonderful advancement and amazing discoveries, have yet to arrive at the Islamic disclosures already made through the holy QUR'AN. America was yet to be discovered and it was the part of the earth unknown to man. Africa was called the Dark Continent.
Man there had yet to learn the necessity to cover its body and was a nude. India was a country with petty princes ruling small states drowned in idolatry rituals extending to human sacrifice. China was led by the impracticable and emotional creed of Buddhism; of the total renunciation of the earthly life which even the people claiming to be Buddhist by creed, could not as a whole practice.
The only hope lay in the most practicable and the most reasonable Faith, Islam, and its practice, but, with the alienation of the AHLUL BAIT from the paramount authority over the affairs of the people, started the corruption in the faith and with OMAYYADS on the throne, began the ever progressive adulteration of the Faith and the unwanted innovations in its practice.
The only hope of the world getting on the right track was in Islam, but with YAZID on the throne declaring disbelief in the bonafide of the apostleship of the holy Prophet and the holy QUR'AN being the revealed Word of God, all hopes of the redemption of humanity form the abyss of material degradation and the lack of the truth about the real Creator of the Universe and the position and the commitment of man in it, were at stake.
In short, the same atmosphere of darkness was once again, impending to shroud the world which prevailed half a century ago and which had demanded the advent of the holy Prophet. But no apostle was yet to come, for the final code of the necessary knowledge and discipline for man on earth been given in the holy QUR'AN.