Now, I realize that rituals are important and useful. I also realize that, any system that puts the good of others above the good of self, when needed, is what gives us much of our progress as a species. It doesn't matter so much, what that system is, but it does matter that such a system exists.
The larger the definition of "others" is, the better. We see this daily, where countries where tribalism trumps nationalism are always at a disadvantage. When you go beyond nationalism, to religion, you have a force that can move mountains.
The perfect world you envision, of no nationalism (I assume because of one world government) and no religion, seems like a recipe for decline and decay. Also, by human nature, I think, if nationalism and religion were taken off the table, we'd revert to tribalism within that framework.