Radley Balko observes: "Romney and his supporters have already deflected as religious bigotry (correctly, in my view) the idea (supported by polls) that America isn't ready for a Mormon in the White House. But Romney has no problem declaring that America isn't ready for an atheist or agnostic in the White House. Frankly, that's offensive."
I agree, but also note this comment from the above video link:
It's not religious bigotry to point out the facts about religions.