The Christianization of Malolos was done by the Augustinian Order in May 1572 thru the effort of Fray Diego Vivar-Ordonez (parochial vicar of Calumpit, assistant to Fray Diego Herrera and Martin de Rada) and it became one of the visitas of Parish of Nicolas de Tolentino (became San Juan Bautista in 1576). Since 1572 the apostolic administration in Malolos was under the Convent of Calumpit. On June 11, 1580 the mission chapel was accepted by the Augustinians as House of Order and became "Iglesia Convento y Malolos" with visitas of Paombong, Matimbo, Mambog and Quingua in 1581. Later due to the frequent high tides that submerged the area, the friars moved the church to its present location in Poblacion in 1590 under the curate Fray Cristobal Tarique, where they started to build a church made of light materials and wood. In 1599 Fray Roque de Barrionuevo started to build a church made of stone and it was finished in 1673. The majority of the residents are Christians. Roman Catholic is the predominant religion in the city.