OK, I got it now. Thanks.
Then why is ID or Creationism (are they the same?) not falsifiable?
How could anything or any idea be "not testable"? Show me an example.
They are not quite the same although ID often serves as a cover for creationism.
Creationism has been falsified. Creationism is the assertion that the Genesis accounts are scientific and can be verified by scientific procedures. In fact, any scientific test of various elements of the Genesis account falsifies them as science. Humans did not appear on earth without a biological history only 6,000 years ago. All sea creatures did not appear on a single day before all land creatures. Plants did not appear before sea creatures and they did not appear all at once with fruits and seed already in the fruit.
The geological strata were not all laid down rapidly in a massive global flood.
All these things have been falsified.
Does this falsify creation or ID? No, it only falsifies the notion that the authors of Genesis were writing science.
ID for the most part accepts that Genesis is not science. It does not focus on specific statements in Genesis. In fact, it avoids the bible altogether.
It proposes strategies for detecting design in nature that has no natural cause--and therefore must come from an intelligence beyond nature.
And it has proposed a number of situations in which IDists claim design can be observed in biology.
It has not had a good record. Almost all (All?) its examples have been shown to be at best, not conclusive, and in some cases the natural evolutionary origin has been actually discoverd (blood-clotting cascade).
Furthermore, ID has not proposed any scientific method of testing out its ideas. So, without a way to test it, it is not falsifiable, and therefore not science.
We can't know it is scientifically valid until it can be tested.
Creation, defined as belief in a creator who transcends nature, also cannot be tested scientifically, for science can only test nature, not what transcends nature.
To some this is disappointing for it means we cannot verify scientifically that God exists. The flip side, is that we also cannot verify God's non-existence. Nothing in science is essentially godless--including evolution.