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Your repeated assertion that the only system people have left in the absence of religiously imposed morality is nihilism is absurd and flies in the face of over 100 years of philosophy and ethics.
Even Immanuel Kant, who was a Christian, was able to formulate a system by which human beings can act morally that does not require divine retribution or an afterlife as the metaphorical stick or carrot incentives. Look up the categorical imperative.
Being an atheist doesn't equate with being a nihilist. You can quote The Big Lebowski all day long; it's a clever film, not a philosophical argument. Atheism just rejects belief in anything without tangible evidence. We have no problem believing in anything for which some proof is provided.