So what if they DO? Anyone can interpret anything to mean anything they want. The plain words they "interpret", they labor to do so. The interpretation they DO use is contrary to the entire teaching of the Koran, therefore they who do the interpreting make themselves infidels by the very word of the prophet.
"they who do the interpreting make themselves infidels by the very word of the prophet."
So What? You seem to be hung-up on whether someone meets your definition of what a muslim shoud be. They practice according to the beliefs of their particular sect.
If people want to believe in snake-handling in their church, that's their business.