"The burden falls on its proponents to show that it is a legitimate theory and should be considered such. They have failed to do so."
How long have you been a scientist? A theory is there to be tested. The "theory" of evolution is still just that because we humans have not discovered all of the links just yet. Tell me about how someone will finally "prove" the Big Bang "theory."
I never said that a theory must be "proved." No theory will ever be proved - that's not what theories are.
The Big Bang theory can be tested. It can be falsified. Predictions about the universe can be made using it, and whether or not the predictions come true is how the theory is tested.
That's what makes the Big Bang theory a theory.
How can ID be tested? How can it be falsified? What predictions about the natural world can be made using it? Those are all questions that proponents of ID must answer before ID can be taken seriously as a theory.