If that's the case I would deem it a mistake to allow the swearing in of Keith Ellison on a Koran.
If an athiest wanted to become a public official and they refused to place their hand on any religious book, would it matter? I wouldn't care if they wanted to place an oath on the Origin of Species. Once each and every country finds a way to separate religion from politics, the better off we all will be.
btw, it's not just islam - we seem to have a judeo-christian problem right here in the USA as well. our wise pres feels that god is telling him how to run the world.