Let’s think about it. If Prophet Muhammad really made up the Quran to promote himself, he would have used it for his own benefit. But in some cases, it happened that the Quran comes with what is against the opinion of Prophet Muhammad, and sometimes the revelation comes too late to judge a severe problem in the Islamic society to test the Muslims although it could have come from day one and end the case.
If someone came and charge a great king’s wife with adultery, then some people began to believe this man and began to talk about that. This king has the media with him and can easily say that this man is a liar and knows that people shall believe the king’s media. Shall the king who loves his wife more than anyone else use the media and say that this man is a liar? This happened with Prophet Muhammad. Prophet Muhammad spent a month suffering till the Quran was sent down from God and said that this man was a liar. If Prophet Muhammad was the one who made up the Quran, he would have made up some verses from day one telling that this man is a liar. He won’t have spent one month in torture and agony if he really had the tool to end this up.
Not only that, but Abu Bakr the father of the Prophet’s wife Aisha used to help one of those who talked about Aisha. When the Quran have shown that Aisha is innocent, Abu Bakr swore that he shall never help him any more. The Quran ordered Abu Bakr to forgive him so that God forgives Abu Bakr. If Prophet Muhammad was the one who made up the Quran, would he forgive that man easily? I don’t think so.
The Quran talks about the stories of the prophets of God from Adam to Jesus. It gives legislations in different aspects of life from politics to economy to social affairs to heritage laws which are actually miraculous as the Quran covers all the heritage problems in only 4 verses. Not only that, but some scientific facts recently discovered were actually written in the Quran 1400 years ago. http://quranteacherleeds.co.uk/