Augustus
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The idea that religion can lead the way to moral progress has been tried. It failed. Its legacy has been the division of humanity into thousands of quarreling sects. Religion is an obstacle to be overcome in our drive toward global harmony.
The idea that there is a global humanity evolved from monotheistic religions, as did the idea of universal morality. It really is remarkably rare in human history.
Also the idea that religion divided people is the exact opposite of the anthropological understanding of the origins of religion. Religions were a way to unite people unrelated by family or tribal ties into ever larger groups. Thinking that we evolved to be one big happy human family is a major failing in your logic.
Without religions we likely never would have got close to modernity, and certainly nowhere near your globalist dream. You could make a case that in modernity religions could be replaced by ideologies, but ultimately ideologies have all of the same problems as religions.