TLC Zeros In On 'RHOSLC' Star Mary Cosby's Utah Church In Explosive Three-Part Docuseries

"Real Housewives of Salt Lake City" star Mary Cosby is the subject of a new three-part investigative documentary all about her Utah church.

The new series, titled "The Cult Of The Real Housewife," promises to pull back the curtain and address the many horrifying allegations that have been made against Mary Cosby and her husband, Robert Cosby Sr.

According to TLC, the network will air an explosive three-part docuseries all about "RHOSLC" star Mary and her husband, Robert, who also happens to be her step-grandfather.

Their church, Faith Temple Pentecostal, has been a subject of speculation for years and was an integral storyline during season 2 of "RHOSLC."

"The Cult Of The Real Housewife" promises to "unpack the allegations behind the headlines and reveal the darker and more unsettling truth" about Mary and Robert.

See the trailer above.

Over three "gripping" parts, TLC will document the "dramatic rise" of Faith Temple — from the foundation laid by Mary's grandmother, Rosemary 'Mama' Cosby, to the "controversial transfer of leadership" and Rosemary's husband's marriage to Mary.

The fiery docuseries will not only explore the behind-the-scenes details of the church, but it will also feature the voices of former churchgoers and "provide deeply personal and disturbing accounts from [Mary's] family members."

"The docuseries also features investigative journalists and bloggers who have been tracking this story from the beginning, as well as a leading cult expert who can offer insight around a playbook designed to enforce loyalty in mind-control cults," the press release read.

In addition to the extremely candid interviews and statements from ex-congregants and family members, "The Cult Of The Real Housewife" will feature audio recordings of "controversial sermons delivered by Mary and Robert Cosby Sr."

Mary's church has been shown in-depth on earlier seasons of "RHOSLC," and during season 2, an alleged former congregant claimed the reality star and her husband were running a cult. "Is it a cult? Yes. Does she call herself a God? Yes," they said during an intense scene with cast member Lisa Barlow.

However, Mary clapped back at those claims during an interview with Entertainment Tonight, insisting people have been calling Faith Temple a cult since her grandmother started it.

"They say that about pretty much every church," she said. "It's no cult. I was taught church should be a place where love always flows."

She added, "The people who know me - my church members — they know those are false allegations."

Fans have already begun weighing in on the new TLC docuseries about Mary and her husband, with one Redditor claiming their jaw dropped over the news.

"I feel like her whole storyline in season 1 and 2 was about the way she ran her church and cult allegations and ever since she came back to the show it hasn't been mentioned AT ALL!" the Redditor said.

Another user commented, implying the allegations against Mary weren't surprising because of the location, adding, "Utah is unfortunately infested with church cults and MLMs that use religion and God to prey on innocent lost people."

"I don't expect much of new information ... but this will be a fun watch," a third wrote. "Honestly, just explaining Mary and her situation to people who don't watch the show ... could actually blow up even beyond the Bravo watchers."

Being based in Utah, a portion of "RHOSLC" is about religion, specifically Mormonism.

Heather Gay has been one of the most vocal members of the cast about her experience, sharing deeply moving stories about her challenging marriage and her decision to leave the church altogether.

She penned a memoir, "Bad Mormon," sharing more of her experience in greater detail, and in November 2025, she hosted a three-part docuseries of her own on Bravo titled "Surviving Mormonism."

According to a previous report from The Blast, Gay's project explored the Church of Latter-day Saints' "seemingly perfect" image, which has long been concealed behind the church's bright, white doors.

In the docuseries, Gay has intense conversations with abuse survivors, ex-Mormons, and former LDS church leaders while reflecting on her own departure from religion.