The idea isn't to spread religious dogma, the idea is to put up non-christian, non-secular sources of what most would consider to be wisdom and watch the hypocrites who made the stupid law in the first place lose their minds that teachers are "putting [Islam, Buddhism, Satanism, etc] in schools". of course, to prevent the teacher from doing that, they would have to sue and potentially have the law that requires teachers to post up the 10 commandments in the first place be declared unconstitutional in order to also remove other sources of religious references.