I’m not a believer, but I’d say that the holy book of one of the biggest religions on the planet is rather important in the global context. It’s literally one of the major ethical foundation of over two billion people or at least a big part of these believers.
So like it or no, it matters on the geo political scale. It certainly matters enough to some people to actually storm an embassy over a perceived great insult. Now if that’s a good thing that so many people take it that seriously is another question. I for one don’t like that, but that doesn’t make it go away.