How about teaching both viewpoints? Or teaching evolution and atleast mentioning the ideas of creationism?
You can teach creationism... in a social studies lesson on Christianity, as well as social studies lessons on Judaism, Buddhism, Hinduism, Islam, Taoism, Confucianism, and Sikhism.
Or maybe as a political issue in a civics/current events class.
Or reading Genesis in English class... along with the Qur'an, Greek Mythology, Norse Mythology, and other creation stories.
Science is: the process of verifying knowledge, and the sum total of verifiable knowledge that was generated by that process.