The argument would usually start off from a scientific theory
which disproves, or rather, challenges the claims made in the
bible.
It would continue then, with the religious factions insisting that
they are right (or not wrong) despite evidence pointing the other
way.
The main issue, as i see it, is that religious factions cannot
simply stand up and say that their doctrinal truth is wrong, or
even flawed. This would result in the religion's natural death;
christians especially since the bible is supposed to be the "the
book of truth", and that everything in it = right and you build
your personal relationship with jesus and god on the truths. Islam,
Judaism and Catholic popes still have their respective clerics and
leaders to inteprete it for them.
There are just so many things in the bible which can be held up as
untruths. I cannot imagine the ramifications if an authoritive
figures even suggests that a single part of the bible may be
flawed, especially the central parts such as the resurrection of
christ.
Again, I stress, I believe christianity is NOT for everyone.
If I were christian, and assuming I have no institutional
respobsibilities, i might simply say,
"ya, well, i'm sure science has its reasons for saying things work
in a certain manner. I cannot disprove it. Perhaps you're right,
the bible IS flawed.
However, my faith calls for me to believe in something else
altogether, and whilst i don't expect you to understand why i would
place so much faith in something i cannot prove, do at least
understand that spirituality and science are 2 different topics
altogether."