Creationist theories are already taught in school..... in Religious Education.
It's just stupid to hold them (creationist) out as scientific theories; they've been formulated, proposed and presented as part of religious texts, hence they're not the results/conclusion of a scientific factual investigation, thus they aren't even considerable as science.
Any 'scientific' presentation of creationism, as well, is designed to both select the 'facts' (often twisted) which best support their arguement, and to try and discredit the alternate theory (evolution - and also natural formation of the earth, and soforth) rather than attempt to definitively prove creation.