Judge Amy Coney Barrett could be President Trump’s nominee to the Supreme Court—a prospect that thrills many conservatives. A former Antonin Scalia clerk and Notre Dame professor, Judge Barrett, 46, seems an ideal choice. Yet her religious beliefs could lead to a contentious confirmation process. Would it be a risk to pick her?

Last year President Trump nominated Ms. Barrett for a seat on the Seventh U.S. Circuit Court of Appeals. Several Democratic senators pondered whether an “orthodox Catholic” would have dual loyalties. “The dogma lives loudly within you,” Sen. Dianne Feinstein said during Ms. Barrett’s hearing. “That’s of concern.”

Video of Mrs. Feinstein’s religious test quickly spread, provoking outrage from thousands of Americans. Yet a New York Times news story suggested she and her colleagues hadn’t gone far enough: The nominee’s “membership in a small, tightly knit Christian group called People of Praise never came up at the hearing, and might have led to even more intense questioning.”

Richard Painter, a law professor and Democratic U.S. Senate candidate in Minnesota, loved the article. He recently tweeted the link, adding his own comment on People of Praise: “A religious group in which members take an oath of loyalty to each other and are supervised by a male ‘head’ or female ‘handmaiden.’ That looks like a cult.” As nonbigots do, Mr. Painter then added, “don’t even try playing the ‘anti-Catholic bigotry’ card.”

It’s easy to make People of Praise sound terrifying. Isn’t there a TV show and novel about these “handmaid” people? Do Americans really want a cultist on the Supreme Court? Despite such insinuations from “resistance” conspiracy theorists, understanding the group requires more than a couple of tweets.