One problem with Intelligent Design is that it doesn't posit any hypotheses of its own, beyond the claim that the universe was intelligently designed. As George Gilder, a long-time affiliate of the (pro-Intelligent Design) Discovery Institute, has said: "Intelligent design itself does not have any content."
Lacking content, Intelligent Design is impossible to refute. Cunning, that.
Daniel C. Dennett explains the approach in detail in:Edge: SHOW ME THE SCIENCE by Daniel C. Dennett
Read Claude de Bigny's take on religious faith and evolution here.
Update: The Case of the Female Orgasm and Intelligent Design