American lawmakers were so up in arms about people burning the American flag both at home and abroad that I think they crafted legislation making it illegal to burn an American flag. While I'm not too familiar with islamic law, ...I'm pretty certain the reaction of Muslims towards those who would desecrate a koran gives me a pretty good indication that perhaps desecrating or burning a Koran doesn't jibe too well with Islamic law either.
Rather than burning korans, bibles, or other books, ...maybe all these religious fundies could just jump in the big bonfire instead.
Legislation has been passed making it illegal to burn the flag but the Supreme Court has overturned this legislation more than once. I'm not saying that makes it right, the law is not always right simply because it's the law, I'm someone whose paid the price for that but nevertheless it is the law.
As for Islamic law, that really doesn't matter and in no way should it have any bearing on this or on anything done in the U.S. We're not under Islamic law and have no reason to abide by it anymore than we do German law. Which brings me to a second point, a bit of an after thought but still important, Muslims are here, fine, but they are here under U.S. law, not there own law...that should matter.