Kathryn Paige Harden left the evangelical church of her childhood and is now a behavioral geneticist at the University of Texas at Austin. She is also the author of the insightful, compelling Original Sin: On the Genetics of Vice, the Problem of Blame, and the Future of Forgiveness. After enjoying her long conversation with Andrew Sullivan, I picked up her book on Audible.
In it, Harden distinguishes between two kinds of sin. Sin with a small “s” refers to individual acts that violate one’s moral code. Sin with a capital “S,” however, describes our enduring tendency to make a mess of things over time—what might be called the arc of human fallibility. To clarify this idea, she quotes Francis Spufford from his book Unapologetic: Why, Despite Everything, Christianity Can Still Make Surprising Emotional Sense, where he famously defines sin as the “Human Propensity to Fuck Things Up,” or HPtFTU.
I was surprised that Harden, an ex-evangelical, would draw on a self-described Christian apologist, so I decided to read Spufford’s book myself. It quickly became clear that he is an exceptional writer with sharp insights into the Christian faith. He captures what he sees as the core message of Jesus: that one must give of oneself freely and without limit, loving and serving others with a pure heart. Intention, in his view, is everything.
Still, something triggered my skepticism. Spufford repeatedly claims that Judaism and Islam, unlike Christianity, emphasize rule-following over inner intention. He uses the term orthopraxy—right action—as opposed to orthodoxy, or right belief. But this struck me as a reductive and biased claim, especially given the abundance of Jewish and Islamic teachings that stress sincerity, purity of heart, and the dangers of hypocrisy. The more he pressed this point, the harder it became to see him as merely insightful; he began to seem like a brilliant writer with a credibility problem.
That problem deepened as I read on. Spufford appears willing to sidestep or reinterpret scripture when it conflicts with his more liberal views, particularly on issues like gay marriage and eternal damnation. There is a certain irony here. He praises Christianity for its emphasis on inner transformation and intention, yet he cherry-picks the Bible and reshapes Jesus to align with his own sensibilities. That project—recasting a religious tradition in one’s own image—strikes me as a task that calls for more self-scrutiny, especially before critiquing other religions for lacking moral depth.
I say this as an agnostic. I’m not troubled by Spufford’s liberal commitments. In fact, I wish the Augustinian notion of eternal damnation were not true. But Spufford seems to want both the moral authority of traditional Christianity and the freedom to revise it at will. He presents the demanding ethical vision of Jesus—love without limits—while setting aside inconvenient passages that might complicate that vision.
Harden, for her part, had the clarity and courage to leave the faith of her upbringing. Spufford also left his childhood religion, but his return to it—on his own carefully edited terms—would benefit from a bit more humility.

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