Epperson v. Arkansas (1968):
...the First Amendment does not permit the state to require that teaching and learning must be tailored to the principles or prohibitions of any religious sect or dogma...the state has no legitimate interest in protecting any or all religions from views distasteful to them.
McLean v. Arkansas (1982), the judge wrote that creation scientists:
...cannot properly describe the methodology used as scientific, if they start with a conclusion and refuse to change it regardless of the evidence developed during the course of the investigation.
Edwards v. Aguillard (1987):
...Because the primary purpose of the Creationism Act is to advance a particular religious belief, the Act endorses religion in violation of the First Amendment.
Webster v. New Lenox School District (1990), the United States Court of Appeals for the Seventh Circuit stated:
If a teacher in a public school uses religion and teaches religious beliefs or espouses theories clearly based on religious underpinnings, the principles of the separation of church and state are violated as clearly as if a statute ordered the teacher to teach religious theories such as the statutes in Edwards did.
Peloza v. Capistrano School District (1994), the United States Court of Appeals for the Ninth Circuit wrote:
The Supreme Court has held unequivocally that while belief in a Divine Creator of the universe is a religious belief, the scientific theory that higher forms of life evolved from lower ones is not.
Kitzmiller v. Dover Area School District (2005):
The proper application of both the endorsement and Lemon tests to the facts of this case makes it abundantly clear that the Board's ID Policy violates the Establishment Clause. In making this determination, we have addressed the seminal question of whether ID is science. We have concluded that it is not, and moreover that ID cannot uncouple itself from its creationist, and thus religious, antecedents.