Intelligent design is a movement that basically says that stuff is too complex to have arisen from evolution. So in that sense they go against one another. But since you you are talking about the larger idea that a higher power created a universe which has "machinary" in which the laws of physics, biology, chemistry, etc. function then there isn't much conflict there. That is how many people, including many scientists, balance science and their faith. Evolution is not concerned with higher powers and stuff. I can only explain real world stuff. Anything extra you want to believe is up to you, don't expect science to help there. That's why it can't be taught in a science class room. Well that's because of the constitution and also because of limited funds. There just isn't the time, resources, or space to do such things. Also, it shouldn't be up to the public school system to teach religion. It's up to the parents to do that. And parents have a choice because they can send their children to private school, teach them at home, or some kind of Sunday school. There are some schools that have philosophy classes and such but that's only in the well funded, upper class school districts where they can afford the teachers. That's another practical reason of how Intelligent Design in school is useless since there is such little exposure to any one topic in a high school biology class it's practically useless.