Whether one uses the layman's term for theory or the more refined, scientific version, one is still dealing with a body of knowledge that is tentative.
True, but your way lacks any scientific credibility, and therefore should not be taught in a science class. It's only an issue of classification. Teaching it in philosophy or religion class is fine with me.
If you allow ID in the science class, you're paving the way for astrology in an astronomy class, or crystal therapy in med school. If it weren't for the scientific process, we'd all still think polywater and N-rays were real. So if you want people to accept ID as science, allow it to go through the established process rather than redefining the process to match your needs.