Maybe yes and maybe not. Let's say the population was actually wiped out over 70% and there was a new world order without religion. Keeping in mind that there are also other factors apart from religion that stirs this major hate that we talk about, so ideally for order to prevail, humans beings would still be classified. They would be put into groups, leaders will be elected and there would be rules and protocol. All of that system of classification may be based on certain factors and criteria. That alone will already be creating apparent differences within the population. People would become more aware of differences and individuality. In essence, even without religion, we might still be saying the same story. It is true that religion and race and tribe causes the major problems of today but those things are indeed the things that define many of us even unconsciously. I'd say we make our around these things.