I'm sorry, but I'm not christian, but I don't think Under God should be removed from the pledge. It's what our nation was founded on, and I don't think it's harming anyone remaining there. The Puritans were not perfect people by any means.. but a lot of their values we still hold today, such as self-reliance, and the freedom of expressing religion.
I think art, music, and other things are entirely necessary in school.. I think it's a big part of life and culture in general, which is something we should uphold.
I won't get into another wall of text.. but pushing math and science like crazy on a kid won't make them want it more. I do agree that schools need improvement, I'm not sure if that's the way to do it though.