© 2011-2019 by Zack Smith. All rights reserved.
Proof by assertion
A claim is deemed to be true merely because it is repeatedly asserted.
People have always said there's a god, therefore it is true.
Circa 1300 AD. the universe, therefore it is.
You can always point out that just because a thing is claimed, this does not mean it was ever proved and without prove there is no reason to believe the claim.
You can question the people who believe the unproved claim, to ask why they never questioned it before.