Here's an informative and concise piece on Sarah Palin's denomination in Christianity Today. I was immediately struck by the quote from Andrew Sullivan that kicks off the article:

I've been hearing how unhinged Sullivan had become, but I haven't read him in an age, and I'm sure the blogosphere has long caught that quip by Sullivan and had its way with it, but forgive me as I had not heard it before. Imagine! "She's a Muslim. That's all you need to know," or, "She's a Jew. That's all you need to know." The rawest of bigotry against Christians is OK I guess.

In any case, the Christianity Today article is worth a few minutes, and also includes a long and occasionally interesting comment thread.

This seems related (regarding an extraordinarily cynical use of religious symbolism by the Democrats): Pontius Palin and Messiah Obama