What makes you think chemistry and physics can't be taught without teaching Darwin's theory of evolution?
Last time I looked most biology classes do not discuss Darwin in depth .
One of the main reasons our students aren't that good in science is because most of our students are illiterate in math. Good math skills are essential to being good in science.
Schools which dump evangelicals into dummy classes will lose some sharp people ,and they should be cut off financially. Religious discrimination is illegal.
You seem to think that science is against ID. What science is really concerned with is the change in scientific methodology that introduction of ID as a religious philosophy into the education system will force. Many scientists I know, including many here have stated that the introduction of any supernatural cause will make the development of theories impossible. If ID can completely remove its reliance on supernatural cause, develop its own theory, including falsifiability and predictive ability it would likely be accepted as a science.
In any case, the methodology which has served us so well is the most important factor in refusing entrance to ID *as it stands now*. Introducing anything that is above the laws of nature can only harm scientific investigation.
If that methodology is corrupted by introduction of ID, more fields of science than evolution will be affected.