They are, until the predictions come true. Countless predictions of future observations have been made using the theory of evolution, and uncannily they always come true when investigated. Successful predictions are one of the requirements for a theory to be considered scientific. ID has mode none to date, and the supporters of ID haven't even proposed any.
Actually, I think Behe has suggested that someone (not him, being too busy I suppose) should consider at some point giving thought to perhaps doing some manner of experiment vis-a-vis ID. See, now isn't that scientific?