Sure - technically every atheist should be agnostic in the sense that you can never know anything with 100% confidence, but pragmatically you live as if you're an atheist. In the strict sense I'm "almost certain there is no god", but no one can be truly certain given the nature of the things Sagan points out.
Just because something is hard to prove with certainty doesn't mean the probability is equally likely. You can't really be a strict atheist about magic sea fairies either, but you probably are (in the sense you that you think they don't exist). Priors matter for things.
While many of those people were charlatans, many of them are also earnest. The water rods people really believe they can detect water with the sticks and have stories about how they helped a friend with a leak and such.
Many astrology people really believe they can make personality predictions (they can't unless they're vague enough to be predictive of nothing). It's not all conartists.
Just because something is hard to prove with certainty doesn't mean the probability is equally likely. You can't really be a strict atheist about magic sea fairies either, but you probably are (in the sense you that you think they don't exist). Priors matter for things.
While many of those people were charlatans, many of them are also earnest. The water rods people really believe they can detect water with the sticks and have stories about how they helped a friend with a leak and such.
Many astrology people really believe they can make personality predictions (they can't unless they're vague enough to be predictive of nothing). It's not all conartists.