Credible in who's mind? In the mind of the believers, yes they threaten atheist with eternal torture during everyone one of these discussions.
Who cares?
If a person who believes in wood fairies says that I’ve violated the forest and I’m going to be punished by them would I care? (No)
And that isn’t it even a fair comparison; for many here a more fair comparison would be
If a person who believes in wood fairies warns me that if I do X to violate the forest I’ll be in danger of being punished by them... that is, because they believe it to be true and don’t care to see harm come to me.
Either way my original point stands. If you don’t believe the threat to be credible it matters not.
