The Texas Board of Education will vote Friday on whether to implement its new K-5 curriculum that calls for expanding Bible teachings in classrooms, after signaling its passage in a preliminary vote.

The curriculum includes Biblical and Christian lessons about Moses, the story of the Good Samaritan, the Golden Rule, readings from The Book of Genesis, and more. The accuracy of the materials has come under scrutiny. For example, the curriculum claims “Abraham Lincoln and other leading abolitionists relied on a deep Christian faith,” though Lincoln’s religion has historically been debated.

The instructional materials, called Bluebonnet Learning, are developed by the state, according to the Texas Education Agency. The lessons would be optional, but districts can receive at least $40 per student for using state-approved materials, according to local legislation.

Some supporters of instituting religion in the curriculum say that these religious texts are important for the historical context of U.S. history and can instill moral values in the classroom. While some critics said, this violates the First Amendment right to freedom of religion for students and teachers, forcing classrooms to engage in Christian instruction.

Texas Gov. Greg Abbott has spoken out in support of the Texas Education Agency’s curriculum after singing legislation directing the Texas Education Agency to purchase and develop instructional materials.

“The materials will also allow our students to better understand the connection of history, art, community, literature, and religion on pivotal events like the signing of the U.S. Constitution, the Civil Rights Movement, and the American Revolution,” Abbott said in a May statement. “I thank the TEA for their work to ensure our students receive a robust educational foundation to succeed so that we can build a brighter Texas for generations to come.”

The Freedom From Religion Foundation, an advocacy organization centering on the separation of state and church, has criticized the curriculum, claiming leaders are determined to “turn the state’s public schools into Christian training grounds.”

“The curriculum targets the youngest, most impressionable elementary students, starting by introducing kindergartners to Jesus,” FFRF Co-President Annie Laurie Gaylor said in an online statement ahead of the vote. “Religious instruction is the purview of parents, not proselytizing school boards. This is a shameful ruse by Christian nationalists in Texas who see the schools as a mission field.”

States like Texas, Oklahoma, Louisiana and others have been behind the push to enforce Christian-based school requirements, including the implementation of Bibles, the Ten Commandments and other religious doctrines in schools.

Editor’s note: A previous version of this story incorrectly stated the grades of the proposed curriculum. The new plan would be for K-5 schools.