The United States Supreme Court has held that the articulated purpose in a state statute allowing for the teaching of creation science in public schools was a "sham" and therefore violated the judicially created secular purpose requirement of the establishment clause.
Edwards v. Aguillard, 107 S. Ct. 2573 (1987).
Constitutional Law - Freedom of Religion - Establishment Clause - Secular Purpose,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol27/iss1/7