It's apparent that Gov Walker, so far, is coming prepared for this onslaught and is proving to be ready for prime time. I would've prefaced your comment with something very similar to the response he did give. Along the lines of, "The president (small 'p' in Obama's case) & I have never had a discussion on theology. Therefore, I don't know what's in his heart. Perhaps you should ask him!".
We’ve watched Walker get this type of press treatment for a decade here in Wisconsin.
Could his answer have been a bit more fine tuned? Maybe. But he’s proven that these type of monotone responses play very well politically even though I know some Freepers would have liked him to go full throated against Obama on this issue.
And the monotone responses drive the media nuts. Walker’s biggest political strength is that bland personality that simply focuses on issues of political and economic freedom. He doesn’t get baited into the Fox News/MSNBC debating society.