Will Smith was, without a doubt, a badass in I Am Legend, but remember Big Willie Style from back in the day? Good luck combing "Getting Jiggy With it" and "Miami" for Scientology references. The musician/actor doesn't consider himself a Scientologist, though he says agrees with most of the group's beliefs. Will and Jada Pinkett Smith founded a private school that supposedly has Scientologist ties. Suri Cruise is enrolled, after all.
Here we have another actress/musician, see a trend here? Juliette Lewis is probably best remembered for playing wackos (a role in Natural Born Killers will do that for you), but she also has a music career, fronting the excellent Juliette and the Licks. Lewis is pretty straightforward about her rock, and the same way about her beliefs.