According to Dries Buytaert, a Franciscan Monk was working on Drupal Core at DrupalCon SF last week; he was involved in the core developer's summit with 149 other attendees.

[At Drupalcon, we] organized a core developer summit with 150 attendees, 16 lightning talks, 11 breakout sessions and 1 Franciscan monk.

Where are the Jesuits? The Dominicans? Any other orders? In the Archdiocese of Saint Louis, many of the curial websites are running on Drupal. I also hear the Legionaries have a lot of Drupal involvement (for instance, their Familia website).