The existence of the Bible is historical fact and artifact. There is historical merit in studying the various religious beliefs of historical peoples that factored into their values and thinking. Protestantism is factually a thing. Different colonies and denominational belief is a thing and a topic in American history. What made Quakers Quakers and how did that impact the Pennsylvania.
There's a difference between teaching the bible, teaching theology, and teaching histories of religion. There's definitely questions of what we are teaching and what is appropriate in public primary and secondary schools and in what subject, but I don't think there is anything in and of itself bad if the historical religious beliefs and impact on historical civic life are discussed.
Well I think the Unions and government need to push back on this (the AG already is). I 100% believe that this should be reveresed. But reading the article it states that losing your teaching license is possible punishment. It's really easy to be high and mighty when it's not your livelihood and job on the line. If you need to wait it out while the courts settle it what do teachers need to do to protect their jobs, stay in compliance, and avoid retaliation until this gets settled? How many teachers already are in compliance just by teaching regular US history curriculum that says "yeah, protestants read the bible and disputes on interpretation of the bible with catholics is part of the history of America." I think it's important to note that the Gutenberg press published the first printed bible. With the increase of education and literacy lay people no longer had to get teachings directly from the literate Orthodoxy. This allowed to different interpretation and rise of different religions which led to conflict, etc...