It has a lot to say ABOUT those who choose to believe in the supernatural. If one chooses to explore intelligent design, even if from a scientific background, that person is then written off. You need only look at some of the posts around FR to see that no respect is paid to those who choose to explore this theory, by those in the scientific community. There is only hostility.
No one is stopping anyone from researching Intelligent Design. There is no Grand Conspiracy Against God™. All legitimate science requires is proof* to back up one's assertions and an opportunity for peer review. It does no researcher any good to argue his theory in the public rather than the scientific domain, as that strategy is typically indicative of a theory that will not stand up to scrutiny.
*This proof must at least indicate the presence of an Intelligent Designer and may not be explained by more mundane mechanisms. So far, nothing has been presented that cannot be explained by those mundane mechanisms. If you have such evidence, you are in line for a Nobel prize, my friend.