If the shoe fits......
From Wikipedia: Charlatan
Synonyms: quack, sham, fraud, fake, impostor, hoaxer, cheat, deceiver, double-dealer, swindler, fraudster, mountebank; informal phony, shark, con man, con artist, scam artist, flimflammer, bunco artist, snake oil salesman; dated confidence man/woman
"the shallow promise of a charlatan selling snake oil"
The ink of the learned is as precious as the blood of the martyr. For one drop of ink may make millions think.