How is it favoring a religion?It of course is, which is why it will be struck down.
Just as it has been in the past.
Stone v. Graham (1980)
The court ruled that a Kentucky law requiring school officials to display the Ten Commandments in public classrooms violated the First Amendment's Establishment Clause.
Given that the State of Lousiana has no excuse for not being aware of their transgression, some civil damages might also be in order.