The key issue is context. You have to read the Quran in it's context as you read the Bible in it's context.
Some key differences:
The Bible was written over a period of several thousand years and covers about 4-5000 years of history. It was written by a large number of authors, and yet remains consistent in it's message.
The Quran covers about 23 years of history, largely written by Muhammad's followers from either dictation or memorisation, though the claim is also made that it has no author, or that Allah is it's author.