LEAH REMINI’s departure from the Church of Scientology has led to an all-out BATTLE between some of Hollywood’s biggest stars!

The 43-year-old former “King of Queens” actress recently made a dramatic exit from the controversial church after she said she was subjected to years of “interrogations” and “thought modification” for questioning leader David Miscavige’s heavy-handed rule of the organization.

Now the church’s top members are terrified that other cash-generous celebrities will follow Leah’s lead – and they’re rallying to make sure it doesn’t happen.

“The Church of Scientology was blindsided by Leah’s exit,” an insider revealed. “Now the organization is on high-alert to discourage others from splitting.

“Whenever someone famous leaves the group and speaks out about bad experiences they’ve had, it adds to all the negative stuff that’s already out there.

“Behind the scenes at the church right now, there’s a bitter tug-of-war between the organization’s die-hard members and those who have defected.”

On one side are some of Scientology’s most powerful devotees, including Tom Cruise, John Travolta, Juliette Lewis, Kirstie Alley and Jenna Elfman, who are working together to make sure other parishioners don’t follow in Leah’s footsteps.

But Leah has her own league of supporters among celebs who’ve also turned their backs on the church, such as Lisa Marie Presley, Katie Holmes, Jason Beghe and Carmen Llywelyn.

Lisa Marie cut ties with Scientology last year. Katie Holmes and her daughter Suri escaped the organization’s clutches after her divorce from Tom Cruise last year.

“Chasing Amy” actress Carmen Llywelyn told The ENQUIRER that her seven-years-long association with the church, which ended in 2002, nearly ruined her life. And character actor Jason Beghe, who’s appeared in a host of TV shows including “Californication” and “Chicago Fire,” defected after having paid the church $1 million over 12 years.

Leah has said she quit the group because of policies that don’t allow parishioners to question Miscavige’s management and the reported abuse of members of its Sea Org militaristic religious order. She also criticized the church for forcing followers to “disconnect” from family members who leave it. The church previously stated with regard to Ms. Remini that it “respects the privacy of parishioners and has no further comment.”

One former Sea Org member, Mike Rinder, who a church representative described as an “anti-Scientologist,” claimed Leah was scolded at Tom Cruise and Katie Holmes’ 2006 wedding after she asked about Miscavige’s wife, Shelly, who reportedly is almost never seen in public.

“She is not missing. Any reports that she is missing are false,” an attorney for Shelly said.

Reports say Leah was put through interrogations, black­listed within the church and had to endure “thought modi­fication” for five years. The church previously character­ized reports that Remini was subjected to interrogations and thought modification as well as statements about church leader David Miscavige as “absurd” and “pure nonsense.”

“Leah is stepping back from a regime she believes is corrupt,” the source said. “She doesn’t think any group should tear apart a family or abuse someone in the name of ‘religion.’”