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'teach evolution instead of creationism'
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Creationism fails the Lemon test established by the Supreme Court in Lemov vs. Kurtzman: Under the Lemon test, a government-sponsored message violates the Establishment Clause of the First Amendment if: (1) it does not have a secular purpose, (2) its principal or primary effect advances or inhibits religion, or (3) it creates an excessive entanglement of the government with religion.
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should mention creationism. It's a longstanding belief which should be addressed on the grounds of scientific verifiability, not on emotional grounds of constitutionality or religious tolerance.
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Yes, science-based courses should mention Creationism, if only as a source of ridicule and an example of the "opposite of Science".