The principles behind this fight are simple. ID and creation stories aren't taught in science class because they are not science and do not stand up to scientific scrutiny. There are lots of people who choose to try to shout their position to try and get it accepted. When that fails, they try to use what is essentially court ordered intellectual affermative action for their strictly religious constraints that they believe must constrain and supercede science. If it isn't in the Bible, it isn't science to these people. They are taking a tactic right out of the extreme left wing playbook.
Here's an essay -- a long one and not an easy read -- about a Brit "intellectual" who embraces ID. The author of the article rips him to shreds, correctly so in my opinion.
Steve Fuller and The Hidden Agenda of Social Constructivism.