I assume Blatty believed demonic possession is possible (hell, even likely) because a few yrs ago he wrote a book about the "true" case the Exorcist was based on (mentally disturbed kid on a bad trip). As for Friedkin, he's pretty much said he believes in demonic possession in a few interviews.
I can see your point about the movie's effect on an ex-Catholic; I come from southern baptist country, so instead of demonic possession, I'm generally more frightened of inter-racial marriages, rap music, and Papists (just kidding).
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