Rather predictable, for the most part. While I understand the point of the rec of Atlas Shrugged - it ventures pretty far into just-so caricature - I doubt any DU-member would have the patience to wade through its secular-sermonizing. Nor do I think they'd have the self-reflection to see that the just-so caricaturing calls out very real aspects of Lib-Prog ideology.
If you want to know where more than a few Libs & Progs get what they "know" about Evangelical and "Fundie" Christians, The Handmaid's Tale is a "good" starting place. They think it's reality thinly disguised as fiction.