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A California teacher has been barred by his school from giving students documents from American history that refer to God -- including the Declaration of Independence.

Steven Williams, a fifth-grade teacher at Stevens Creek School in the San Francisco Bay area suburb of Cupertino, sued for discrimination on Monday, claiming he had been singled out for censorship by principal Patricia Vidmar because he is a Christian.

"It's a fact of American history that our founders were religious men, and to hide this fact from young fifth-graders in the name of political correctness is outrageous and shameful," said Williams' attorney, Terry Thompson.

"Williams wants to teach his students the true history of our country," he said. "There is nothing in the Establishment Clause (of the U.S. Constitution) that prohibits a teacher from showing students the Declaration of Independence."

Vidmar could not be reached for comment on the lawsuit, which was filed on Monday in U.S. District Court in San Jose and claims violations of Williams rights to free speech under the First Amendment.