Established in 1574 and completed in 1598, considered as one of the oldest religious edificies in the orient and a pilgrimage site in the region, if not in the whole country. It was initially administered by the Augustinian Friars and given to the secular clergy in 1772 until it was handed back to the Augustinians in 1854.

This life-size crucifix of impressive countenance and of very dark brown color was found by fishermen of SINAIT at the shoreline of Logo in the year 1620. Sculptured on hard wood, it stands 18 feet high. The statue was then placed inside the church of Sinait and immediately became a spiritual attraction of the region, being a miraculous provider to the needy and a healer of the afflicted. A Spanish architectural structure which houses the life-size statue of “Apo Santo Cristo Milagroso” or “Apo Lakay”, a wooden Black Crucified Christ that also gave the identity of Sinait in the Christian World as the “Quiapo of the North”. The church had been chosen during the advent of Golden Jubilee Year, 3rd millennium, as pilgrimage church in Ilocos Sur by the Archdiocese of Nueva Segovia and thousands of pilgrims and “Bisita Iglesia” flocked here to visit “Apo Lakay” for devotion and intercession especially on Fridays. This sanctuary has been blessed with an approval in Rome by Pope John Paul II as future Basilica Menor.