Really school books are decided at a very high level, as choices that each school board can make are determined at Houghton Mifflin and what they and other houses publish.
Also, big states like California and Texas drive the text publishing houses.
Gimme a break, local school boards are severely limited, but may not simply be aware of it. The limiting takes place far, far upstream...in a secular humanistic galaxy far far away.
Not really following your train of thought. I was just commenting on your statement "The government does not have the right, nor the duty, to determine the content of education for citizens". Local governments do that every day. The school boards and teachers determine the contents of what is taught. What you said about publishing houses is also true and they shape the secular crap we get etc etc But your original statement I commented on is not correct.