Legislating his Catholic religion would mean outlawing the eating of meat on Fridays.
pst: I think they dropped that, but man we used to get some good fish sticks at school every friday because of it.
Believe it or not, it hasn't changed all that much. As Catholics, we're still supposed to abstain from meat on Fridays OR (and here's the new option) perform some other act of pennance on any given Friday.