Shroud of Turin
The idea that the shroud of Turin is the burial shroud of Jesus and somehow has "miraculous" properties is a totally irrational precept. Every test they've taken points to it being a mideval hoax. And how would it have gotten from Israel to Northern Italy and then been forgotten about for more than a millenium? The only arguments they have are completely pseudoscientific, such as that carbon dating doesn't really work or that somehow a house fire nearby in the 17th century was able to change the nuclear structure of the molecules in the shroud!
Matt Shizzle has been banned from the Rational Response Squad website. This event shall provide an atmosphere more conducive to social growth. - Majority of the mod team