(CNN) — All Oklahoma schools are required to incorporate the Bible and the Ten Commandments in their curriculums, effective immediately, the state’s chief education officer announced in a memorandum Thursday.

At a State Board of Education meeting, Oklahoma State Superintendent of Public Instruction Ryan Walters said the Bible is “one of the most foundational documents used for the Constitution and the birth of our country.”

“It’s crystal clear to us that in the Oklahoma academic standards under Title 70 on multiple occasions, the Bible is a necessary historical document to teach our kids about the history of this country, to have a complete understanding of Western civilization, to have an understanding of the basis of our legal system,” Walters said.

Every classroom in the state must have a Bible and all teachers must teach from the Bible in the classroom, Walters said.

The Oklahoma memorandum follows a law in Louisiana passed June 19, that requires all public classrooms to display the Ten Commandments. A group of Louisiana parents and civil rights organizations are suing the state over the new law, contending the legislation violates both US Supreme Court precedent and the First Amendment.

Oklahoma’s directive “is in alignment with the educational standards approved on or about May 2019, with which all districts must comply,” according to a news release.

“The Bible is an indispensable historical and cultural touchstone,” Walters said in the release. “Without basic knowledge of it, Oklahoma students are unable to properly contextualize the foundation of our nation. This is not merely an educational directive but a crucial step in ensuring our students grasp the core values and historical context of our country.”

The new memo comes after the Oklahoma Supreme Court blocked an effort to establish the first publicly funded religious charter school in the country. The court on Tuesday ordered the state to rescind its contract with St. Isidore of Seville Catholic Virtual School in a 6-2 decision with one recusal.

“Under Oklahoma law, a charter school is a public school,” wrote Justice James R. Winchester for the court. “As such, a charter school must be nonsectarian. However, St. Isidore will evangelize the Catholic faith as part of its school curriculum while sponsored by the State.”

Walters called the ruling “one of the worst” decisions the state Supreme Court has made and pledged to “fight back.”

“What the court did was rule against the parents of Oklahoma who have demanded more choices for their kids. We have a great opportunity to make sure that parents have the most options of any parents in the country here in Oklahoma, by giving them the ability to go to a public school, charter schools, private schools, this would have been the most unique charter school in the country,” Walters said.

“So I want you all to know, we will continue to fight back against this, we want to continue to provide an opportunity for parents to send their kids to high-quality schools.”

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