In a WaPo op-ed, Eugene Robinson offers some good insights on the intelligent design v. evolution controversy. He proposes that intelligent design, in addition to not being a science, seeks to take away faith. If you can prove God exists, then you have no need of faith.
One of the best definitions of Christian faith is attributed to St. Paul, who called it "the substance of things hoped for, the evidence of things not seen." At every Mass, Roman Catholics around the world "proclaim the mystery of faith." There is no need to have faith in something that can be touched, measured, quantified, predicted; no need for faith in something that can be seen if only we build a big enough telescope or a sensitive enough electron microscope.