Do Christianity and Islam bear the marks of having been "intelligently designed" by a single creator?

They must claim to be "intelligently designed" because they are based on "revelations." Now, "revelations" should be distinguishable from human doctrines built through cultural exchange and progress, right? Otherwise, naming them "revelations" is misleading. It's the same problem creationists have: they can't demonstrate that creationism can explain anything that evolution cannot.