It seems that Sagan focused upon that rarest of atheists....the strong atheist.
Those of us who disbelieve in gods because there's no evidence/proof will
typically notice that there's no evidence/proof that gods cannot exist.
Ya just can't be certain of such stuff.
VERY well stated!!
To state with certainty as a theist that a God must exist, or does exist…and to state the polar opposite with certainty as an atheist…is arrogant on both ends of the spectrum, indeed.