It is often said that the Qur'an is like the Bible: one is the holy book for Muslims, and the other is for the Christians. This is not a very accurate way of looking at the situation though because the two books are very different. The Bible is really a collection of many kinds of writings (prophecy, poetry, genealogy, history, personal letters, and so on) written by a large number of people across over a thousand years. The Bible was written in three languages across three continents (Europe, Asia, Africa).
The Qur'an is wholly different. According to Islam, it was not written by anyone, it was revealed, word for word, from God, by the angel Gabriel (Jabriil in Arabic) to Muhammad throughout his life. The Qur'an consists of 114 chapters, called surahs in Arabic. These surahs are organized like Paul's letters to the churches: from longest to shortest. The second is "The Cow" which is 31 pages long (in the translation I use), and the last one is "The Men" which follows:
SAY: 'I seek refuge in the Lord of men, the King of men, the God of men, from the mischief of the slinking prompter who whispers in the hearts of men; from jinn and men.'
That is the entire surah.
The word "qur'an" is possibly derived from the Arabic word qara' which means "he read." The word itself means something like recitation.
The content of the book is much more uniform than that of the Bible, as could be expected from a book produced by one person over a much shorter period of time. There are dietary laws, there are rules about how the believers should interact with Jews and Christians and idolators. There are regulations about the use of the spoils of war (there is a surah called "The Spoils"). Every aspect of life is touched upon, much like the Torah for Orthodox Jews.
There is a great deal of equivocation about the Jews and the Christians in the Qur'an. There are some positive remarks, like, "Believers, Jews, Sabeans, and Christians--whoever believes in God and the Last Day and does what is right shall have nothing to fear or to regret." But then two paragraphs later we find this: "Unbelievers are those that say: 'God is one of three.' There is but one God. If they do not desist from so saying, those of them that disbelieve shall be sternly punished." (5:69 ff.) There are many examples of this throughout the entire book, so it is not surprising that among Muslims there are so many points of view. (Also you will notice that the author obviously does not grasp the theology of the Trinity. This is not the kind of thing a Muslim can say though since each and every word is from God.)
The same can be said in terms of the use of violence, though the verses limiting violence seem to be fewer in number than those extolling it as long as it is carried out correctly. One that is frequently quoted in the Western press is this: "whoever killed a human being [...] shall be regarded as having killed all mankind" (5:32ff). These seem like the words of a religion of peace indeed. But the entire verse needs to be examined to understand how it has functioned throughout history:
"That is why We laid it down for the Israelites that whoever killed a human being, except as a punishment for murder or other villainy in the land, shall be regarded as having killed all humankind; and that whoever saved a human life shall be regarded as having saved all mankind."
So if there is "other villainy" then capital punishment is called for. Such crimes include insulting the Prophet and renouncing Islam. And lest we be impressed by this graciousness, we find this admonition a few verses later, "As for the man or woman who is guilty of theft, cut off their hands to punish them for their crimes. That is the punishment enjoined by God. God is mighty and wise." Fortunately most Islamic countries do not do actually do what "God enjoins." But you can clearly see that there is no question of this being a rule for a specific people at one time in history. It is more like a command for every believer in the world throughout all of time.
Let me know what questions you have. I have quoted mostly from "The Table" in this e-mail, if you would like to read the entire surah.
Peace be with you all.