Why would creationism need to be taught in school, when it is only pseudoscience?
Teaching creationism would be like teaching astrology, fortune telling (like tarot, crystal ball), and have no place in schools. Creationism is not worth the time taken unless the school is a Christian private school, where theology can be taught. Creationism is theology and faith-based, and unless the student is planning to become priest or theologian, then it is next to useless for students seeking careers outside of their personal belief/faith.
If a student chooses faith over more practical life, then that the student's choice, but it needs to be learn at his own time, and not during school hours.
Look at this way, if school slot time for mathematics, the teachers never teach their students numerology. If school provide time to teach astronomy, they don't teach them astrology. If this is so, then why should creationism be taught in a biology subject, when you know creationism is not "science"?
Creationism is irrelevant, when it comes to science. It is only the ignorant and literal creationists who want to waste valuable times in science classrooms. Seriously. How do you set up a science lab for experiment on creationism? If you want to create something, then you will need the Creator. So how do you get the Creator/God to create something? Do you pray for something god-like to happen? What would be the purpose of doing a prac report on God, when God don't exist?
Perhaps if a student pray hard enough, God will do his homework for him.