The Need to Evolve

[Sheldon]

And I don't want to beg the question by dismissing anything for which we don't have a certain kind of objective evidence.

Does that apply to the Greek gods as well?

Or Mermaids or Unicorns come to that, if a dearth of objective evidence is not a reason to disbelieve a claim, then what I wonder is a sound criteria for disbelief? Then there are unfalsifiable ideas of course where the claim, and its contrary claim, cannot conceivably be falsified even were they to be false. We cannot rational believe all unfalsifiable claims, as it must involve believing contradictory claims, we cannot believe some but not others without bias, for or against, thus the only rational open minded position seems to be disbelieving them all, but keeping an open mind if any objective evidence is produced or discovered.