They are, but ID is a strategy to combine the more undeniable elements of evolution with mainstream religion (that which we practice, as opposed to actual doctrine - you wouldn't believe how many Catholics don't even know the Eucharist is Christ's body, and not just a symbol of it...)
The ID camp seems to be made of those uncomfortable with 1) duality 2) ambiguity 3) the potential to be wrong.
I have no problem with any of those - and though I've carefully avoided the word "relativism" in my argument - most purists (my own code for "fundamentalists") of both evolution and creation can't seem to cope, for some reason. I don't know what their problem is, honestly, except they are worried what kids are taught. But I guess that's a valid motive.
Except the main "scientific" proof for ID is that life is Behe's irreducible complexity which disallows the possiblity of evolution.