From Supernatural selection:Daniel Dennett, however, is no great believer in respectful noninterference, and in his new book, ''Breaking the Spell: Religion as a Natural Phenomenon" (Viking), he argues vehemently against it. Religion, Dennett says, is human behavior, and there are branches of science to study human behavior. ''Whether or not [Gould] was right," Dennett told me in his office at Tufts University, where he is director of the Center for Cognitive Studies, ''and I don't think he was, I'm not making a claim that he would disagree with. I'm not saying that science should do what religion does. I'm saying science should study what religion does." (emphasis mine)
The argument that religion can be explained as a natural rather than a supernatural phenomenon is not new. The Scottish philosopher David Hume set himself a similar task over 250 years ago. Marx and Freud had their own explanations. Over the years, scholars have enlisted everything from rational choice theory to brain scans in their efforts to trace the origins of faith.
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Evolutionary bases for the existence of religion is something I've thought about for a while.