He said that the First Amendment works by "building a wall of separation between church and state."

VOA: special.2009.05.22

Later cases ruled that teaching religious creation stories in public schools violates the First Amendment of the Constitution that calls for separation of church and state.

VOA: special.2009.12.01

This idea is often described as "the separation of church and state."

VOA: special.2009.05.22