"Someone would still insist on getting their dates by extrapolating from the passages on 'who begat who'."
From my vague recollections from the one and only time I tried to read the bible, in the bit where they are claiming ridiculously long life times for some people, I think if you substituted "months old" for "years old", they would come down to more likely ages.
I gave up on the old testament when things got horridly violent, and picked things up again at the beginning of the new testament. Apparently I missed the fun and games in Solomon.