Tom Cruise is the face of Scientology and he convinced Nicole Kidman and Katie Holmes to join the church during his respective marriages to them. Of course neither marriage lasted, and Kidman and Holmes both left the church, with rumors it was the controversial religion that played a role in the demise of each relationship.
Neither has commented on the rumors, and Kidman told The Hollywood Reporter, "I've chosen not to speak publicly about Scientology. I have two children [adopted with Cruise] who are Scientologists -- Connor  and Isabella  -- and I utterly respect their beliefs."
Meanwhile, actress Nazanin Boniadi -- the woman who was allegedly handpicked by the church to be Cruise's girlfriend from November 2004 until January 2005 before running afoul of the religion's leader David Miscavage -- also left the church. Vanity Fair claims Boniadi's decision to leave the church came after she was punished for her insubordination by having to scrub toilets with a toothbrush, clean bathroom tiles with acid and dig ditches in the middle of the night, and later was sent out to hawk Scientology founder L. Ron Hubbard’s Dianetics on street corners.
Director Paul Haggis famously said goodbye to the church and Xenu -- the dictator of the "Galactic Confederacy," who according to the religion sent billions of frozen souls on spaceships from his overpopulated planet to the bases of volcanoes on Earth, which later were scattered into human bodies, giving them emotional issues -- in 2009 with a scathing public letter.
"G.I. Jane" actor Jason Beghe has been one of the most vocal stars to leave Scientology. After 13 years as a member, he left in 2007, and released a video in which he spoke out about the church.
"Scientology is destructive and a rip-off," the actor said in the video. "It's very, very dangerous for your spiritual, psychological, mental, emotional health and evolution. I think it stunts your evolution. If Scientology is real, then something's f**ked up."
And Lisa Marie Presley, whose father Elvis once said of the religion, "F**k those people. All they want is my money," opened up about her decision to leave the church, telling USA Today:
"I was slowly starting to self-destruct, and I didn't know where that was coming from. I started to uncover the main person who was really close to me for years, and then it was a domino effect. I was devastated," she said, adding, "I got bad advice. I was insulated with no grip on reality. They were taking my soul, my money, my everything.”