It took no time at all for Scientology to crop up in the Katie Holmes/Tom Cruise divorce chatter. TMZ quotes sources as saying it's the main reason behind Holmes' decision to split. The actress is reportedly worried that Cruise is going to start immersing daughter Suri into the church now that she's 6. That fear is why Holmes is seeking sole custody and also why she filed the papers in New York, which doesn't like to award joint custody to "warring parents," notes TMZ. This is shaping up to be a lousy summer for Scientology, and Slate lays out some more reasons why.