When you consider someone a prophet, the distinction is meaningless. For the Christian and Jew, if it is in the Bible, it is God's word, period. We may know when God is speaking directly, but we also believe it is ALL God's word.
Therefore, it is no small step to see how many Muslims believe it is ALL Allah's word, and is to be obeyed.
The portions that were not "revealed" are well known and understood for what they are. On the other hand, there is this Sharia business - that's Islamic law. It was developed based on the supposition that learned men, properly counseled in the revealed Word of God, could sit around asking "What would Mo or his disciples decide", and come up with a good answer.
The Sharia grew out of the same sort of thought that undergirds the "What Would Jesus Do" business. The inherent danger in this, as we were warned from the most ancient times by all the prophets and by Jesus in his day, is that it sits up men to be "like God", and presumes they may make "God-like" judgments. The correct approach is to look at what Jesus did and said, and what his disciples did and said, and what the prophets did and said - not would they "WOULD DO" or "WOULD SAY".
I hope you can understand this.
About 1000 AD the Moslem world got caught up in the development of Sharia and froze itself. They haven't made a serious change in the law for a millenium. About all you get are a bunch of bearded old men sitting around reviewing the Sharia to see what has already been decided and then issuing fatwa after fatwa. It's all akin to sorcery and necromancy. It's about as useful, too!
The most extreme Fundos in the Moslem world hold the Sharia and it's derivative fatwas to be supreme guides to living. They hold that the Koran has been interpreted in its totality in the Sharia. Where Sharia and Koran appear to conflict, they adhere to the Sharia.
They are, in short, "Hypocrites", as described by Mo, and must be dealt with in the same manner. BTW, it's the "Hypocrites" that Mo is directing his followers to kill. Quite possibly it would be only Protestants who would argue that the Koran be placed ahead of the Sharia as a guide to life. Catholics would do something similar to what Moslem Fundos do and is turn to canon law, or Church tradition (and various rulings on faith or morals issued by various patriarchs or the Pope.)