Scientific Relativism?

While reading posts on the topic of I.D. in the classroom, It occurred to me that something seems to now be occurring on the Right (religious or otherwise), that has mainly occurred on the Left. Let me explain: cultural or moral relativism is something much of the Left seems to adhere to, and much of the Right abhors. But now, some on the Right seem to be saying: "well, Evolution is just a theory. I.D. is also a theory. Why not teach them side-by-side? " This seems to me to be a dangerous path to start down. I think we've relatevised enough (and in fact need to do some back-tracking); let's not do it to science, too.