The singer/actress has credited the controversial faith with helping her win her battle with drugs, insisting Scientology helped her put her life back together.
And Lewis can't stand to see Cruise, one of the Church's most high profile supporters, criticised in the press over his beliefs.
She says, "It's been written about in such an obscene way, but it's very common-sense based. It's a progressive religion. You can be a Jewish or a Buddhist Scientologist and people don't understand that. I feel so sad for the ridicule that Tom Cruise got, and he's such a gracious, caring human being."