(quote from RealReality.org/Real_Faith_and_Reason_Vol_2_-_Scientia.pdf)

Some people truly believe making up stuff is the only way to know truth. How do they prove it to themselves? They use made-up stuff to prove it to themselves. Since they believe making up stuff is proof, they see nothing wrong with using made-up stuff as proof that made-up stuff can be proof. In other words, they tell a story. In their story, they say we must base all knowledge on made-up stuff. Then, they use their story to prove their story is true, which is a circular-reasoning fallacy.

(end quote)