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I'm sure, had there been no religion, morals of today would have been drastically different.
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Not only that. According some scholars, without believing in fiction Homo Sapiens could not have become rulers of the Earth. The ability to believe in fictitious stories helped Homo Sapiens to gather in large numbers(over 200 individuals), and to defeat the Neanderthals, who were much stronger physically.
LOL didn't H. sapiens interbred with Neanderthals? (At least humans that migrated out of Africa.) In a sense they never really completely died out. They ceased as a group because the modern humans are better at hunting than them.