Churches in Mexico

Does anyone know how I can locate a certain church in Mexico? For example, I know that my grandmothers parents were married in San Juan de los Lagos, but I do not know what church. THe document says the priest is Don Urbano Barragan Velasco, a minister is also listed as Presbitero Francisco Esquivel and a "Father Priest" Senor Cura Pantaleon Fortolero. The priest who certifed the document in 1950 is named Estaban Sanchez V. I guess I may want to search the surnames of the priests to find family members who can tell me where this church is located. Any other suggestions?