As a part of history, perhaps a cursory overview of the world's various religions, and how they each have impacted history would be valuable, if it could be done in such a way as not to endorse one over another in the classroom setting.
But then, of course, the question comes to mind, who decides which version of history? Each country, culture and religion seems to have their own version. How does one actually arrive at a completely objective historical interpretation? Is that even possible?
As an aside, History is not even taught anymore in Philadelphia in the public schools. It was replaced about 25 years ago with Social Studies. I remember taking my girls, when they were in grade school, to a large suburban mall nearby where a huge relief of Washington Crossing the Delaware was on display. They had no idea who he was or why he was in the boat crossing the Delaware River. I had mistakenly assumed that they were learning history in Social Studies. As they never had books to bring home (supposedly because the Philadelphia School District couldn't afford to buy books for each child and they just shared what books they did have in class), I really had no way of knowing what they were being taught or not being taught). So, whatever history they do know, I taught them. To this day the subject of history is still not being taught in Philadelphia public schools. I wonder if this is the rule or the exception across the United States.
Another thought comes to mind, how does one monitor the lessons to insure that particular teachers are not setting forth their own particular beliefs as dogma? What types of safe-guards would be set in place to insure that one religion is not proffered above another in a public school classroom setting? How would this impact the separation of Church and State issue?