There's lots of useless things already, religion being the first one that comes to my mind.
Religion was never mentioned in any of my classes; in fact it was strictly avoided, and afaik it was avoided in my kids' schools as well. In a Catholic school, sure, but not public school.
The first thing that comes to my mind that's useless is DARE, the second thing is PE. There are a lot of examples, but yours was a poor example indeed. In fact, I think if they learned about Bhuddism, Hidusim, Islam, and other mostly non-US religions it would be a good thing to study in a Social Studies or history class.
And make more choices to the students to take the classes they're interested in
An eight year old has no business choosing his or her classes, although the parents should. Actually, HS students as well. Kids simply don't have the experience or knowledge to be able to make such an important decision. That's why you have to be 18 to enter into a contract.