No Christian that I know of observes the prohibition on shrimp (generally because they believe that part of the Torah has been abrogated, or doesn't apply to Gentile Christians). However, many observant Jews do (as the commandment concerning shrimp is part of the Jewish law). Perhaps before ignorantly making a mockery of a belief—that has clearly not been understood in the first place—it might be worth checking *whose* belief you are ridiculing.