perhaps it's the fundamentalist mentality that was implanted in me, but in my eyes for the bible to be considered divinely inspired, the WHOLE thing has to be inspired. if it contains errors, then it is not what it claims to be and should be viewed as simply a man-made book of man-made hopes, dreams and myths. it was this that caused the whole bible to crumble in my hands.
there's so much that can be torn apart in the old testament (for instance, according to bible chronology, the incident at the tower of babel happened 144 years after the flood. this is not possible. either the bible writer was lying or the event was sensationalized. either way, NOT divinely inspired), that many people feel pretty comfortable viewing that as tribal mythology. i agree, but for me that kind of leaves jesus hanging out to dry.
the way i see it, the messiah jesus depends on the garden of eden and the flood (he apparently believed it to be a real event), among other OT traditions. for me, the fact that these 2 things (eden and the flood) have been demonstrably proven false (to me, at least), left jesus hanging by an amazingly thin thread. it was then that i felt comfortable letting the bible go.