I think religion as the first means of forming a civilization, could determine the advancement of a race. Long ago people had hundreds of gods and people were relatively happy, then people fought over which God or gods were superior. These conflicts shaped people tolerances and ideas thus effecting the route these people take as an advancement. Lets use the Dark Ages as an example the scientific advancement was at a stand still because the Vatican considered science to be a perversion from God. My own theory is that without the advancements of science people were kept subservient on the church for guidance. Religion is a basic double edged sword, providing law and order yet stopping natural advancement at the same time. Of course reckless advancement without stability wouldn't be so favored either.
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