Over the weekend, the Department of Defense stepped into one of the more delicate questions in American religiosity: who gets to be called “Christian.”

More specifically, does the Church of Jesus Christ of Latter-day Saints (commonly called the Mormon Church), fit the bill?

The brouhaha started with Secretary Pete Hegseth’s plan to simplify and reform the work of military chaplains — those religious and spiritual advisers who tend to the faithful within the military’s ranks.

A Pentagon spokesperson on Friday posted a new list of categories of religious affiliation for military service members, which had shrunken from over 200 to 31 labels. In previewing this reform, Hegseth had argued that it was part of the Trump administration’s fight against secular humanism and for the role of religion in public life. By narrowing the number of religions, and excluding some prior identity groups Hegseth’s Pentagon found objectionable, officials argued it would be easier to assign chaplains to units.

“This brings the codes in line with its original purpose, giving chaplains clear, usable information so they can minister to service members in a way that aligns with that service member’s faith background and religious practice,” Hegseth said in a video statement in March.

Gone were “atheist” and “Wicca” from the new list — and though the Church of Jesus Christ of Latter-day Saints was included as a religion, it was not labeled “Christian.”

That set off an explosive reaction from Mormon elected officials, including some normally aligned with the administration. To them, the government seemed to be saying that Mormons are not Christians — a highly offensive statement for LDS Church members, who see Jesus Christ as the center of their faith.

“I can say confidently that the U.S. government has no business recognizing the Christianity of literally every other religious sect that worships Jesus Christ — with one exception,” Sen. Mike Lee (R-UT) posted on X, one of many complaints he raised over multiple days.

On Monday, the Pentagon said the move was unintentional — and amended the original document that blew open this controversy. “The Pentagon’s job is not to adjudicate theological debates, but instead to ensure sincerely-held faith is respected and encouraged in our ranks,” an official statement read. Lee said he was “thrilled” with Trump’s response after he discussed the issue with the president in a phone call.

But the fiery response spoke both to the LDS church’s long battle for acceptance in America’s faith community, and to deeper tensions within the religious right in President Donald Trump’s second term. Even as the administration tries to privilege Christianity in America, its coalition is suspicious about which kind is taking the lead.

Mormons have often faced a hostile reception in mainstream religious life since their church’s founding in the 19th century, a wound that the Pentagon decision reopened.

Despite a tense history between the Church of Jesus Christ of Latter-day Saints and both the American state and other religious groups, there’s been a kind of detente in the 21st century.

Mitt Romney’s 2012 presidential campaign was widely seen as a watershed moment for Mormonism’s mainstream acceptance, especially within the Republican Party’s conservative Christian electorate, even as his faith was a sensitive topic at points during the race.

“It’s not like those theological concerns about Mormonism disappeared in 2012, but by the time we got to 2012, the issue wasn’t Romney’s Mormonism anymore,” David Campbell, a professor of American politics and religion at the University of Notre Dame, told me. “And so a lot of members of the LDS church thought, well, this issue’s over now.”

As Campbell noted, however, there were still major doctrinal differences between LDS and major branches of Christianity. For example, LDS theology does not accept the Trinity — the idea that God is both one being and manifested in three essences (the Father, the Son, and the Holy Spirit). Roughly, LDS believers view Jesus Christ as the Son of God and a distinct entity to God the Father, who has a separate physical body.

More simply, the LDS Church rejects the Nicene Creed — the statements of faith that have united most Catholic, Orthodox, and mainline Protestant churches for more than a thousand years as well as the Apostles Creed (which most western Christians accept). For these reasons, many Catholics and Protestants would not call Mormons Christians, even if they believe in a God and follow Jesus Christ.

The Pentagon dust-up brought these divides rushing back to the front of mind.

“When Mormons have come into the public square and have sought to build bridges politically, that has been acceptable,” Campbell said. “But when that theological question comes up, maybe some have been won over, but not very many. And this is just yet another reminder of that.”

One example of this submerged tension came up during Romney’s 2012 run, when a prominent Texas evangelical pastor, Robert Jeffress, called Mormonism a “cult” and argued Romney “is not a Christian.” But Jeffress also endorsed Romney in the general election, citing their shared values apart from theology — and he is now a prominent Trump supporter.

Some LDS voices on the left argued that Mormon Republicans had been too naive in thinking that a White House that elevated figures like Hegseth, an evangelical who has pushed boundaries with his Christian rhetoric in public duties, would protect religious freedom rather than elevate political allies. Some linked the Pentagon list to the administration’s embrace of “Christian nationalist” evangelical leaders who have called for tearing down walls between church and state.

“For us on the left, it’s like, yeah, of course the Trump administration doesn’t believe in our version of Christianity,” Eric Biggart, chair of the LDS Dems Caucus, told ABC4, a Salt Lake City news station. “That’s been clear to us for 10 years now.”

Republican lawmakers who protested the Pentagon’s decision did not make this argument themselves and appeared to accept the official explanation on Monday. But it’s also noticeable that they did not give Hegseth the benefit of the doubt when the story first emerged — the response to the Pentagon’s list was immediate and public, rather than delivered quietly behind the scenes. Loyal Republican politicians like Sens. Mike Lee and John Curtis immediately criticized the decision and spent the weekend debating theology, engaging other Christians, and calling out the Department of Defense.

This episode is probably not going to be a turning point, Campbell told me, but it is another crack in the religious right’s coalition. Many LDS members already view Trump and MAGA with suspicion in comparison to other conservative religious communities, although he’s made inroads with LDS voters since his first election. To some, the episode was a sign that members of the faith should be suspicious about tying their religion to a political coalition.

“I say this with love to my fellow Latter-day Saints: the sooner you give up trying to convince the religious right to validate your faith, the sooner you’ll know peace,” McKay Coppins, an LDS journalist who has written extensively about the church, posted on X.

“Are we real Christians? Only one opinion matters — and it’s not Pete Hegseth’s.”