In American TV shows religion is probably never mentioned, however Mexican soap operas which are showed in Univision mention religion especially Catholicism quite often. I was watching Cuidado con el Angel with my mom the other day. At the end of the show the main characters daughter is sad because her mom is blind so she and her grandma pray the Hail Mary. This would never happen in ABC or FOX. I included the video just skip ahead to 3:50 and watch.