The rationale for justifying any of my beliefs stems from an overarching belief that the Bible is the word of God. Once I've accepted that, there isn't much need to justify any specific belief arising from that overarching acceptance: God says it's so - who am I to argue with God?
That's all very well, but the question is: which parts of it are "the word of god"? The reason why I ask is that there are many parts of the bible which directly contradict one another, and there is some extremely strange (and sometimes downright dangerous) advice in there, if you examine the whole document.
It seems to me that it's impossible to believe the entire thing, as you would have to simultaneously believe two, and sometimes even three or four different versions of the same story.