San Pedro Church is the city's oldest church built way back in 1847 during the Spanish occupation in Davao led by the Spanish Conquistador Don Jose Uyanguren. It can be found at the corner of San Pedro Street and CM Recto Avenue. The original structure was built by the Spanish conquerors centuries ago. In fact some of the statues and the chapel on the right side of the church were few of the things that were present during the time when the church was established.
San Pedro Cathedral is actually one of the few churches that are protected by the government for being a National Cultural Treasure. Indeed, this church has been recognized by the Philippine National Commission for Culture and Arts as part of the country’s natural treasures. In truth, San Pedro Cathedral is not just recognized for its historical significance; it is also recognized for its geographical influence and unique position in a region that is largely dictated by the Muslim beliefs and culture.
People from Davao who are known to be devout Roman Catholics flock San Pedro Cathedral almost everyday to attend masses most especially on Sundays. It is also one of the busiest areas in the City because of the vendors and people going in and out of the church.
Here's a link of the Catholic Mass schedules of the church: http://www.mass-schedules.com/catholic-church/30/san-pedro-cathedral.html