Well, one of them, anyway. The problem with using The Bible as a moral guide is that it can be, and has been, used to support pretty much everything.
The bible has been used to support slavery. It's also been used to oppose it. It's been used to show that premarital sex is evil, and also to show that it's alright. It's been used to support women's rights and oppose them. People have used it to argue for and against gay marriage. People have even made biblical arguments for and against environmentalism. The only thing I can think of that the bible has only been used to support one side of is bestiality. That's not saying a lot.
How are you supposed to find out what's right when the Bible supports and opposes whatever you want resolved?
This video makes about the same points from around 11:00 to 11:50. It also makes many other good points.