Having read this letter I think you should make the point that there isn't a genuine scientific controversy.
Ths entry at
Pure Pedantry looks like it could be useful even though it mainly deals with global warming.
You could also refer to the
Wedge Document
From the first sentence there's plenty of ammunition
The proposition that human beings are created in the image of God is one of the bedrock principles on which Western civilization was built
Most notably the "Strategic Plan":
Phase I is the essential component of everything that comes afterward. Without solid scholarship, research and argument, the project would be just another attempt to indoctrinate instead of persuade
As can clearly be seen Phase I failed, there is no soild scholarship, research and argument supporting ID - yet the ID movement moved on to phases II and III anyway. It seems that ID is "just another attempt to indoctrinate".