Isaac Asimov in _In Memory Yet Green_ gives us this anecdote
about a religious argument he once had. Bear in mind that for most of
his life (including its end) he was a Jewish atheist.

	Sometime around WWII, IA had the acquaintance of someone that
he had once wanted to meet for dinner. So the two homed onto a
date. When he learned of the first date IA proposed, he commented
coldly that "I will be at my devotions" -- on the evening of Yom
Kippur (Day of Atonement), when Jews are supposed to fast and
contemplate their sins over the previous year. So the two settled on
the evening just after.

	So the two met, and IA's acquaintance lectured him at length
on the depths of his apostasy -- that he not only did not observe Yom
Kippur, he did not even know what day it was. IA got very
uncomfortable, but he did want to see his acquaintance end his
fast. Sundown came, and he ordered:

	Ham on rye.

	And IA made some comments to the effect that God just might
forgive an honest atheist who made no bones about his beliefs, but
that he would never forgive a sniveling hypocrite who beats his chest
in temple, but who cannot wait to get out and fall upon the flesh of
swine.