Are there always fanatics?

But if religion didn't exist, I'm nearly certain people would become "fanatics" about something else.

So, lets let them continue killing each other over religion? I don't see the point. It's like saying why bother curing malaria, people will just die by a different disease. If you are able to eliminate one cause, it is worthwhile to do so. If people fight over economic, political, etc. problems, I think it is worthwhile to eliminate those problems as well. To say that people will always become fanatical about something else once these problems have been eliminated is incorrect evident by the societal health of the Scandinavian countries.