http://anonymouscomics.forumotion.com/t21-comix-only-a-scilon-would-get How's that for a fast response.
I know it isn't a 'webcomic' but a several month old Simpsons comic book (#179) seems to reference (the church of) Scientology...(or maybe just references the author's perception of them?) "When Lenny discovers a way to happiness through involvement in a new self-help movement called Scifiometry, Homer and his fellow barflies are determined to save their pal from financial and spiritual ruin." - http://simpsonswiki.net/wiki/Simpsons_Comics_179
https://www.gocomics.com/tomthedancingbug/2005/07/09 I think he has another one. Will post if I find it.