Bishop Wayne Jackson, who is the pastor of Great Faith Ministries International in Detroit and calls himself a lifelong Democrat, remembers Mr. Trump’s campaign visit to his church. He told me that the moment Mr. Trump got out of the car, “the spirit of the Lord told me that that’s the next president of the United States.”

Evangelical leaders also see a civic obligation to speak godly counsel to him, on policy and personal matters. He is, after all, the president. And it’s paying off. I’ve watched Mr. Trump through the lens of the faith community for years, and he has delivered the policy goods and is progressing on the spiritual ones.

My reporting suggests Donald Trump is on a spiritual voyage that has accelerated in recent years, thanks to evangelicals who have employed the biblical mandate of sharing and showing God’s love to him rather than shunning him. President Trump told me that he “was exposed to a lot of people, from a religious standpoint, that I would’ve never met before. And so it has had an impact on me.”

This president’s effect on our cultural norms has been shocking. His critics would call it appalling; evangelicals say it’s immensely satisfying: They’ve seen a culture deteriorate quickly in the past decade, and they’re looking for a bold culture warrior to fight for them. Showing that God does indeed have a sense of humor, He gave them Mr. Trump. Yet in God’s perfection, it’s a match made in heaven. Mr. Trump and evangelicals share a disdain for political correctness, a world seen through absolutes and a desire to see an America that embraces Judeo-Christian values again rather than rejecting them.

Finally, why in the world wouldn’t evangelicals get behind and support a man who not only is in line with most of their agenda but also has delivered time and time again? The victories are numerous: the courts, pro-life policies, the coming Embassy in Jerusalem and religious liberty issues, just to name a few. He easily wins the unofficial label of “most evangelical-friendly United States president ever.”

Does Mr. Trump have moral failings? Yes. Critics will suggest a hypocrisy coming from evangelical leaders who are quick to denounce the ethical failings of others who don’t have an “R” next to their name. But the goal of evangelicals has always been winning the larger battle over control of the culture, not to get mired in the moral failings of each and every candidate. For evangelicals, voting in the macro is the moral thing to do, even if the candidate is morally flawed. Evangelicals have tried the “moral” candidate before.

Jimmy Carter was once the evangelical candidate. How did that work out in the macro? George W. Bush was the evangelical candidate in 2000: He pushed traditional conservative policies, but he doesn’t come close to Mr. Trump’s courageous blunt strokes in defense of evangelicals.

Evangelicals have found their man. It may seem mystifying to outsiders, but for someone like me, with a front-row seat to an inside view, it makes perfect sense. Maybe they’re taking their cue from Billy Graham, embracing presidents with moral failings rather than rejecting them.