Correct.
The Intelligent Design scientist starts with an observation from nature.
Wrong. There's no such thing as an intelligent design scientist. ID is a completely bogus pseudo science designed to sell books to dishonest radical fundamentalists who think they are sneaky enough to get superstition and myth taught in science class without real scientists ever noticing the difference.
Sounds like a huge helping of ad hominem to me.
So you ask:
How can you debate a person who does not exist on a subject that isn't real?
I totally agree with you! It can't be done!