There are times in life when the institutional ground underneath you begins to crumble — and with it, longstanding attachments. Such is the case for me when it comes to the Republican Party and evangelicalism.

I’ve been a part of both for my entire adult life. These days, though, in many important ways they are having harmful effects on our society.

The latest example is in Alabama, where Roy Moore, the Republican Senate candidate, stands accused of varying degrees of sexual misconduct by nine women, including one who was 14 years old at the time. Mr. Moore leads in most polls, and solidly among most evangelicals, heading into Tuesday’s election.

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Just the other day I received a note from a friend of mine, a pastor, who told me he no longer uses the label “evangelical” to describe himself, even though he meets every element of its historical definition, “because the term is now so stained as to ruin my ability to be what evangelicalism was supposed to be.”

Another pastor who is a lifelong friend told me, “Evangelical is no longer a word we can use.” The reason, he explained, is that it’s become not a religious identification so much as a political one. A third person, who heads a Christian organization, told me the term evangelical “is now a tribal rather than a creedal description.” In October, the Princeton Evangelical Fellowship, a campus ministry for more than 80 years, changed its name to the Princeton Christian Fellowship. “We’re interested in being people who are defined by our faith and by our faith commitments and not by any sort of political agenda,” according to Bill Boyce, who has led the campus group for decades.

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Assume you were a person of the left and an atheist, and you decided to create a couple of people in a laboratory to discredit the Republican Party and white evangelical Christianity. You could hardly choose two more perfect men than Donald Trump and Roy Moore.

Both have been credibly accused of being sexual predators, sometimes admitting to bizarre behavior in their own words. Both have spun wild conspiracy theories, including the lie that Barack Obama was not born in America. Both have slandered the United States and lavished praise on Vladimir Putin, with Mr. Moore declaring that America today could be considered “the focus of evil in the modern world” and stating, in response to Mr. Putin’s anti-gay measures in Russia: “Well, maybe Putin is right. Maybe he’s more akin to me than I know.” Both have been involved with shady business dealings. Both have intentionally divided America along racial and religious lines. Both relish appealing to people’s worst instincts. Both create bitterness and acrimony in a nation desperately in need of grace and a healing touch.

I hoped the Trump era would be seen as an aberration and made less ugly by those who might have influence over the president. That hasn’t happened. Rather than Republicans and people of faith checking his most unappealing sides, the president is dragging down virtually everyone within his orbit.

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Institutional renewal and regeneration are possible, and I’m going to continue to push for them. But for now a solid majority of Republicans and self-described evangelicals are firmly aboard the Trump train, which is doing its utmost to give a seat of privilege to Mr. Moore. So for those of us who still think of ourselves as conservative and Christian, it’s enough already.