That's two different claims. To conflate the two is a category error.

…hat it’s the one true source of morality. If you’ve heard it once, you’ve heard it a million times: “Without God, there’s no morality.” Or “Christianity is the moral foundation of Western civilization.” People act like Jesus wrote the only manual on how to be a decent human being.

Is Christian Morality Really Unique or Divine?

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Tanner the Humanist