text: what's the difference between old testament and new? are christians supposed to believe only or the other, or both? if you believe in god and the bible, why would one part of it be wrong and the other right? were they written far apart from each other (in terms of when they were written)? the word bible actually means "little books."  it took over 1600 years to write.  the bible is not an unrelated assortment or collection of man made fragments from jewish and christian literature. rather, it is an organizational book, highly unified and interconnected in its various segments, which indeed reflect the systematic orderliness of the creator-author himself. god’s dealings with israel in giving them a comprehensive law code as well as regulations governing matters even down to small details of camp life—things that were later mirrored in the davidic kingdom as well as in the congregational arrangement among first-century christians—reflect and magnify this organizational aspect of the bible.  the bible has a theme that is carried out from genesis to revelation which is basically, 'from paradise lost to paradise regained'  it talks about how god is going to use his kingdom to bring back the paradise conditions that adam and eve lost and vindicate his name in the process.  the hebrew scriptures (ot) talk about the history of the jews as they watched and waited for the messiah.  the christian greek scriptures (nt) tell about the messiah and what the future holds as he, the king of god's kingdom works to bring back paradise to the earth.