If one has to find their own meaning, then we live more fully, aware that we have no other chance. I do think Judea/Christian religions have a tendency to dull that "lust" for life. I also wonder if we wouldn't appreciate life more and work harder to make it wonderful for all. Probably neither atheism or religion would change a particular individuals lust for power, but I wonder if there wouldn't be more overall respect for life if we weren't relying on a spiritual Being to make sense of hardship or to provide a hereafter.
I don't think this negates the meaning that spiritual traditions could hold. I think it all depends on interpretation.
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