It seems obvious from the content of your posts that you want the exact opposite of the 1st amendment. Requiring Bible studies in the K12 curriculum negates that amendment. Your bland assurances that it is all about teaching "world history" and "culture" is Christian nationalist doublespeak for religious indoctrination. The schools already teach social studies and literature without the religious indoctrination that would inevitably get injected into classroom-mandated Bible studies. Any Christian children in public schools who want to focus on Bible studies can form an extracurricular club for that purpose. You have given us no reason to think that all schoolchildren need to join that club.
I understand where you are coming from and why. You hold the same position I held over 10 years ago when the issue came up with the 10 commandments being removed from federally funded public places, and when it was deemed inappropriate to pray with a team as a team, etc. I've changed my stance since, and this is due to the ongoing effort against religion in general.
I honestly don't care if it is included in the classroom as an academic. I am ok with it, so long as it's not taught in a way that is aimed to convert or indoctrinate the students. If it is handled as an academic, and in terms of social world dynamics and human history, borrowing from the influence it has had on the world, it could be most beneficial to include the text along with an appropriate way to acknowledge its influence, from art to literature and music, and on to how it has influenced the nations in the realms of international world government and foreign policy.
As for teaching the precepts and specific doctrine in the schools, I am opposed to this. I'm also opposed to a bias based on a religion in our governmental policies and laws. This would create too much bias, and if one is enabled this would in effect enable all to act in like manner. This is specially what many of us have been so concerned about in years past with the issue. Understanding that religious nations sometimes aim to force their laws and penalties on their citizens has been a subject of concern for several decades if not more. This will never be even remotely satisfactory for anyone. So, despite your presumption that I am advocating a theocracy, I am not. I'm an American who values our 1st amendment rights.
The bland assurances whatever you may think they are, are less about assurance and more so about expectations that professionals will be placed into position for the task of teaching the academic as history, art, social influence, and the dynamics involved as opposed to the doctrine so many presume will be forced on the students. If this is ever going to happen, someone will be required to take the first steps.