This is a demonstrable untruth. Just ask John the Baptist. Or Paul of Tarsus. Or an untold number of saints.
You might want to take it up with King David, too. Remember Goliath?
Posting sensational claims that are easily proved wrong do nothing to help your cause.
I'm not sure what your point is anyway, since beheading was often performed because it was thought to be more humane than say, being drawn and quartered; or being hanged, which often resulted in the condemned person dying of slow strangulation. Or disembowelment, which was practiced in many places, including England.
As for religion, Mormons accepted beheading as a form of punishment in Utah until the 19th century, as did the Vatican.
I think he was only speaking of beheading in islam, and the fact that they deny it is part of their practice, which IS the REAL demonstrable truth here.
He didn’t say no one else ever did it. What he said was it was a direct order from momadman hisself. (And most of it is not in the q-ran, but in the hadiths.)
How many Mormons were there before the 19th century? Zero.
Well, closer and more relevant to our times, the Fabulous Furry Freak Brothers accepted be-a-heading as a form of reward in the 1970s, so there!