And now you know why!! LOL!
What part of Italy was your grandmother from? My ex-husband's family is from the Province of Molise. They had VERY "hebraic" habits. For example, when a member of the family died, that person was buried within 24 hours, the family did not cook but sat around the dining room on little stools while neighbors brought them food, they covered the mirrors in the house, the men did not shave for 7 days ... no need to continue, you get the picture. They were all baptized catholics.
My manager at the time was a Jewish convert to the Mormon church. He explained that during the crusades, it was not unusual for European Jews to "hide" under the mantle of the accepted faith. They retained their traditions inside the home but, for all intents and purposes, displayed catholic postures and in public. My husband vociferously denied being a Jew but ... hey ... actions speak louder than words! Not one member of his family ever attended church, except for a marriage or funeral ... and, even then!