Creationism / Intelligent Design and Separation of Church and State

Edwards v. Aguillard (1987) said a state law mandating teaching “creation
science” alongside evolution in public school violated the First
Amendment’s establishment clause.

Epperson v. Arkansas (1968) struck down a state law that criminalized the
teaching of evolution in public schools, finding that the law violated the
First Amendment.

In Kitzmiller v. Dover Area School District (M.D. Pa. 2005), a judge ruled
that requiring teachers to teach both Intelligent Design and evolution
violated the First Amendment.