Newt’s about as Catholic as Henry XIII.
Sorry, Huck. It appears that Henry XIII (of Bavaria) was most likely a practicing Roman Catholic.
(You must have meant Henry VIII, King of England. Of course, he too was a Catholic for a time in his life when he accepted the Church's sacraments.)
But the just of your comment is entirely correct.
We could trade Catholic for another "C" word: Conniver.