A new Kentucky law going into effect Thursday will allow Bible courses to be taught in public schools.

Gov. Matt Bevin (R) signed the bill Tuesday, NBC News reported, but watchdog groups concerned about church and state separation fear the classes may cross the constitutional line and go from teaching to preaching.

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“Right now the language of the bill is very vague and the Kentucky Department of Education has not yet put together a curriculum,” Amber Duke of the Kentucky American Civil Liberties Union said.

“The concern, though, is that you could have a curriculum that is constitutional and could be delivered in a manner that is not constitutional.”

The Bible class is meant to “establish an elective social studies course on the Hebrew Scriptures, Old Testament of the Bible, the New Testament, or a combination of the Hebrew Scriptures and the New Testament of the Bible,” according to the bill.

And it’s meant to “provide to students knowledge of biblical content, characters, poetry, and narratives that are prerequisites to understanding contemporary society and culture.”