First off many thanks to the sender. This poster is from a group called SAC and appeared over Dublin in the mid 80s (1987?) .
“THINK -Thought Kills All Known Clerics. Dead.” was a play on an ad for a popular detergent. The image also has nuns and priests going down the toilet.
More details about the poster and SAC in the clippings from Hot Press below the poster.
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[...] On then to a strange poster from SAC that was posted over Dublin in 1987 “THINK -Thought Kills All Known Clerics. Dead.” [...]