How to test and falsify Intelligent Design
To test the design inference all one has to do is to demonstrate that the object/ event in question can arise via nature, operating freely- ie it is reducible to matter, energy, chance and necessity.
If nature, operating freely can account for it then the design inference is unwarranted.
So there you have it. All the anti-ID mob has to do is to actually start supporting their position and ID will fade away...