Bulletin-board posting was part of what public schools are supposed to be doing in teaching about Islam, Christianity and other faiths in ways that are constitutionally and academically sound.
Update: Lawrence, KS officials have banned the project, saying the proposed art installation would amount to animal cruelty. The Kansas code allows “with respect to farm animals” for “normal or accepted practices of animal husbandry, including the normal and accepted practices for the slaughter of such animals for food or by-products and the careful or thrifty management of one's herd [...]