The interior of the church is Baroque with Neoclassical elements, which is sometimes called "Republican Baroque." It contains oil paintings such as those depicting the birth of the Virgin Mary, the Announcement to the Virgin Mary, Mary and Joseph, and the Sacred Heart of Jesus. Sculptures include those of the Archangel Michael on the main altar, Diego de Alcalá, and Salvador of Horta . The altars are made of wood and plaster painted white and decorated in gold leaf. There is also gold leaf on the vaults and walls. The cupola contains allegorical paintings and on the pendentives, there are the four doctors of the Catholic Church, Francis de Geronimo, Pope Gregory I, Ambrose and Augustine of Hippo, as well as images of John Duns Scotus, Bonaventure, Bernard of Siena, and Anthony of Padua. There are also allegories representing Justice, Faith and Virtue. The vaults contain images related to the praying of the Rosary.