For previous case opinions, he should stick to the facts of the particular case and limit answers to the laws in question.
-PJ
If so, then he needs to respond something like this: Why are practicing Roman Catholics subjected to a religious test but secular ones get a pass?
That line would work well for any other religion, but work especially well for Roman Catholics for two reasons: (a)there are so many of them and (b)they are the major swing voting constituency.