The quote below came from Section III, second paragraph of Epperson v. Arkansas.
"Government in our democracy, state and national, must be neutral in matters of religious theory, doctrine, [393 U.S.97, 104] and practice. It must not be hostile to any religion or to the advocacy of no religion; and it may not aid, foster or promote one religion or religious theory against another or even the militant opposite. The First Amendment mandates government neutrality between religion and religion, and between religion and nonreligion.
We at "Origin of LIfe Fairness in Public Schools, Inc." interpret this to say that "abiogenesis" and "evolution" as religious theories, can not be aided, fostered, or promoted over all other religious theories in public schools.
We also interpret that quote to say that you can not promote any religions or religious theories over any others, thus requiring all be taught, or none.