No, Philip Seymour Hoffman is not a Scientologist. I even went through a long list of famous Scientologists just to make sure.
The reason you might be confused is that, one of the last projects Philip Seymour Hoffman worked on before he passed away is a movie called The Master, which is based on Scientology.
It looks pretty deep, so my kind of movie. I plan to see it if I can find someone to take me ;-)
There's nothing to suggest Philip Seymour Hoffman was at all involved in Scientology.
There are some conspiracy theories about his death, claiming that the Church of Scientology may have had something to do with it due to his prominent role in a film dealing with the religion and its preachers and belief system.
There is no verifiable evidence to support this claim though.
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