Because I've never had any reason to believe that it wouldn't be a huge waste of my time to learn what creationists or IDers say.
I've spent a bit of time, as I did just now at the link you gave, reading and listening to creationists and IDer.
What I have seen is a gross misunderstanding of actual science.
For instance, it's simply not true that real scientists (the non-creationist types) cannot explain fossil fuels -- as I just read in a piece on the site you linked to.
Whenever I look into creation science, I either see such absurdities (why waste my time reading someone so completely clueless?), or misunderstandings of what evolution actually says, or a general atmosphere of assuming "god did it" that is at its base anti-scientific.
Although difficult to grasp (accurately), evolution makes sense, when one applies oneself to understanding it.
I see no reason to abandon it in favor of nonsense.
That's why I don't spend a lot of time trying to learn what they say; life's too short.
I'd rather spend my time learning real science.
Real science is thrilling and endlessly fascinating, not to mention mind-bogglingly useful.
If I'm going to read fiction, I'll read Harry Potter, or other fiction that's more entertaining than "Christian Science."
When I'm in the mood to read science, I read the real stuff, not fantasy.