You needn't have a strong religious faith to appreciate the peaceful atmosphere of Sao Salvador Cathedral. Inquire when the next service starts or when it's open for general viewing.
If you're planning to stick around a while in Campos Centro, Sao Salvador Cathedral is a good place to start your sightseeing. This principal church is one of numerous attractions worth seeing here. Boulevard Shopping Mall, SESC Campos, and Estadual do Norte Fluminense University are also waiting to be explored close by.