It's the assumption that facts are malleable, truth fungible, history spinnable and reality re-writeable.

These people pontificate about "secular humanists" lacking the conviction of their moral bedrock, then act as if self-righteous pomposity somehow immunizes them from skeptical scrutiny.  

They lie when it's useful, they lie when it's convenient, they lie out of habit.  They've been lying so long they can't distinguish reality from make-believe.  

They're on a cakewalk to oblivion.