some texts were written by historians who tried to show what ancient israel was like. other texts are poems about god and his work. and others were used to make laws. followers of judaism and christianity consider the bible sacred but they do not all agree about what belongs in the bible. what is considered part of the bible changed with history. different denominations include certain parts or leave out other parts. there is not one single version of the bible; both the content of the books and their order may change.