Scientology, which now claims to have 10 million members, and has been the brunt of ridicule (see Tom Cruise), skepticism (see Tom Cruise) and craziness (see you-know-who), now has its own murder. That is the focus of tomorrow night's "48 Hours Mystery." The story is about the horrific 2003 murder of a gorgeous, upstate, Scientologist mom, Elli Perkins, by her 28-year old schizoid son, Jeremy.