The Parish of Gaiarine is dedicated to Saint Thomas of Canterbury.
The parish church was consecrated in 1443 and originally housed altars dedicated to Saint Thomas and Saint Zacharias. The building was subsequently reconstructed in the style of provincial Renaissance and was reconsecrated in 1559 by the Bishop of Ceneda.
The original layout was characterized by the presence of the bell tower on the facade. Between the end of the 18th and the beginning of the 19th century, restoration work was carried out on the sacristy and the rectory. A radical intervention in 1927 profoundly modified the structure and orientation of the church: the 19th-century choir was demolished, and on the opposite side, a new choir was built, preceded by a transept, above which a dome covered in copper was constructed. The neo-Gothic bell tower was built between 1900 and 1905.
Of particular interest are the altar of the Blessed Virgin of the Rosary, decorated with marble inlays and already present in the first parish church, and the wooden altar of Saint Francesca Romana, with a Baroque style. Among the paintings, a panel once attributed to Paolo Veronese, now more likely attributed to his son Carletto Caliari (1570–1596), stands out, depicting the Madonna with Child assumed into heaven and adored by Saints Thomas of Canterbury and Zacharias.
