As stated above – you should believe your own interpretation of the bible. But that also means you also have to be ready to listen to other interpretations, and prepare to let your own interpretation grow with those.
Unlike @Austinlad, I am more than happy to state that I don’t think you should believe that the bible is the word of god. A literal interpretation just gets you mixed up in a quagmire of contradictory statements which can only be resolved through non-literal interpretations, but then you are taking some parts literal, and some parts as metaphors, and it all breaks down. If you believe that it is the word of men inspired by god, that’s something I have to respect. But men are fallible, both in agenda and in communication (whether they said something they didn’t mean to, use colloquialisms that don’t hold over time, transcribe something wrong, translate something wrong, lose a page, lose a book, etc.).
Is the bible true? No, I believe it’s not. Is there truth in the bible? Yes, I absolutely believe so. And the truth you can gain from it will become more clear to you if you study it not in a vacuum, but with an eye to it’s historical moment, development, interpretation, criticism, and the teachings it contains that are similar and different from other religions and moral philosophies.