I'm assuming this is a private school? If so you pretty much sign off most of your rights as long as you are there.
Most of them are pretty much standard school rules, and I don't see much issue with them.
Disciplining us for not completing our work.
Well yea, sorta prepares you for life. If you don't complete something by the time its due it can get you fired at work.
Threatening to enact new polices to limit our freedom if we keep "group violating" school policies.
You mean like trying to make the teachers and staffs life harder, I mean if you are trying to send a message find a different way because obviously you are pissing off the faculty.
Issuing detentions for not saying the pledge of allegiance.
That I do agree is bullshit, but again doesn't mean you should be disrespectful when its being done.
Taking our phones and not returning them.
If you get caught texting the teacher will take it, probably in your syllabus... Also it is pretty annoying to teachers who are trying to do their job and you don't pay attention.
Issuing detentions for refusing to say anything to a teacher.
Little vague there, but are you saying that you get punished for not responding? Yes, common courtesy to respond if they ask you a question. Again in the future if your boss asks you for something and you just shrug he/she off that won't go well.
Swearing at students.
Not very productive and won't work well in the real world with co workers.
Refusing to allow us to dispute wrongfully issued detentions.
Well that all depends on the situation. But by the looks of it, you are trying to get in trouble.
Disciplining us for not having the required school supplies.
Well go buy them. There is a reason why its called "required" you usually need them. If you don't then that slows down the class for everyone because you are not prepared.
Refusing to prove they have the authority to "insert action here"
Sigh, the "you don't control me" yes, yes they do. Your parents signed the teachers and staff off as your guardians essentially.
Okay to sum it up it seems like you have a bad case of teenage angst imo. If you don't like the school then talk to your parents. Because I'm guessing that they are the ones paying for it.
Now I could be wrong and this turns out to be the school ran by Satan himself, but it doesn't seem that way.
School prepares you for the real world, and if you don't work well with others or your uppers then life becomes a lot more difficult. You are not above everyone else, sorta have to deal with it.