If I stayed faithful to what God said, "Take heed that you inquire not of other nations and how they serve their gods," and replied that I would want NO religion in textbooks, then the Bible would be gagged as well.
Take heed that you are not snared and that you inquire not after their gods, saying, How did these nations serve their gods?
for every abomination to the Lord which He hates they have done to their gods (Deut. 12:30)
Thus says the Lord: Do not learn the way of the heathens
You shall not walk in the manner of the nations which I cast out before you, for they committed all of these things and therefore I abhor them (Lev 20:23)