"up in arms" perhaps, but not taking up arms! I don't quite think even the religious zealots in the USA would start burning embassies over a cartoon. Boycotts, protests, name calling, perhaps a little rioting, but surely not burning embassies, and calling for death to the artists.
Tom,

They might not be up in arms now, but if we look to our history books their has certainly been plenty of blood spilled in the name of Christianity. And let us not forget that a Christian in charge of our country took the US to war in Iraq for false reasons, which has taken over 20,000 Iraqi lives (and 2,249 American lives to date).

Cheers,
D.