"I'm not about to shut up," Leah Remini warned when she left the Church of Scientology amid whispers of scandal last summer. Now, she's making good on that promise in a blistering new interview that reveals disturbing details of her "horrendous" Scientology childhood, and the moment she discovered that "everything the church had taught me was a lie."

Remini first joined the church as a child, when her parents moved the family from Brooklyn to The Church of Scientology's Clearwater, Florida, cam