Merriam-Webster's word of the day for Tuesday 8/26/2008 is sophistry:
1 : subtly deceptive reasoning or argumentation 2 : an argument apparently correct in form but actually invalid; especially : such an argument used to deceive
"An argument used to deceive. " Hmmm... that got me to thinking of the words of the serpent in the Garden:
"Hath God said...?"