Exactly, Penelope and Carly!
Those books were written by men.
I see two possibilities:
1- written by men, inspired by God (if you consider he exists).
2- Written by men who needed an explanation of the world and principles to rule their lives, just as every human group in human societies has always done, resulting in a great variety of religions.
In either case, it's men writing about the world such as they saw it 2000 years ago. Things like love, respecting your parents, murder, etc... haven't lost their meaning, but it's absurd to refer to the Bible to say that abortions or assisted suicides are forbidden by the Book. How could the people of two thousand years ago have known how societies and medical science would develop, how societies would evolve to tackle moral questions because of those evolutions and because of changes in what is now felt to be acceptable, or no longer acceptable?
Whatever wisdom they got from god had to be translated into something they could understand.
I hear that it is different with the Koran and that the Prophet was more like a transmittor, each word being dictated by God.