Its impossible hold all religions correct at the same time too many different ways to enlightenment, if you know what I mean.
There many web sights discussing the history of the bible.
http://atheism.about.com/library/weekly/aa032199c.htm It is a human inclination to fo seek the truth.
But when you only have one or a few sources the end result is what you wanted in the first place.We should follow rules that would give objective results regardless of our beliefs.If you ask what is the meaning of life, you are assuming there is a meaning.