No. Out of curiosity, what made you think that it might be? As far as I know, Steven Wilson has been quite open about his nonbelief, for example in this interview where he calls himself an "archetypal atheist": Innerviews: Steven Wilson - Art as a mirror. read more
Porcupine Tree were an English rock band formed by musician Steven Wilson in 1987. The band began essentially as a solo project for Wilson, who created all of the band's music. By late 1993, however, he wanted to work in a band environment, bringing on frequent collaborators Richard Barbieri as keyboardist, Colin Edwin as bassist, and Chris Maitland as drummer to form the first permanent lineup. read more