Via Creative Minority Report comes this sad Philly story. Now, I'm not an advertising expert but I am attentive. It seems to me that the most likely market segment to attend a Catholic School, that isn't already in attendance, is local Christians who are fed up with irreligious public school. An ad for this market would be easy to spin off if you were familiar with the jargon.
"Here are Our Lady of Perpetual Responsibility, our students talk to Jesus every day."
"If you want your children to learn the beauty of God's creation, have them join us at St. John's school."