If you are a believer, would these tongue-in-cheek T-shirts* offend you? Or do they amuse you?
In either case, you’re likely to talk about it.
Products with controversial or debatable issues have that effect – creating buzz. Some people will hate them (lobby against it, or smash shop windows) but in many cases such products have the ability to create rabid fans.
*spotted in the Haight-Ashbury area of San Francisco.