Well, I really have a big problem when folks say the Bible is not a rule book. The Bible is a rule book (among many other things). The Bible is where we get our faith from. These rules (commands) are to draw us closer to the author (GOD). Jesus says if you love me, keep my commandments (John 14:15). Jesus said if you will enter into life, keep the commandments (Matthew 19:17) (Also see Luke 10:25-28). While Christians are only under the New Covenant; There are tons of commands in both the Old Covenant and the New Covenant. Unless stated otherwise (like in the majority of 1 Corinthians 7), Paul says, "If any man think himself to be a prophet, or spiritual, let him acknowledge that the things that I write unto you are the commandments of the Lord." (1 Corinthians 14:37).
Also, there is no misquoting anything out of context, either. The text is clear in 1 Corinthians 7:39 and Romans 7:2 that the Law of marriage is not ended for a person unless the other spouse dies. Jesus was also clear that we could only divorce over unfaithfulness because Jesus said this was the only exception; And even then, God still hates divorce.
Note: While Paul was giving us marital advice in 1 Corinthians 7, he was also giving us commandments of the Lord in regards to marriage, too (See: 1 Corinthians 7:10-11).
The Bible is our rule of faith and practice. To go outside of God's Word on spiritual matters is to add to His Word and that is spiritually dangerous. The only reason somebody does not want to do a particular thing that the Bible says is because they simply do not like what it says.
Side Note:
Please keep in mind I also believe the Bible is a Story Book or a Book of Stories because it contains stories within it, too.