The Assembly of God church collapsed in the industrial suburb of Diadema.
Fire authorities say those injured included three children who were rushed to a local hospital and released shortly afterward. Three other slightly injured people were pulled from the debris.
The department's press office yesterday said rescue teams were searching for other people who may have been trapped under the rubble.
It was unclear how many people were inside the church when it collapsed.
The cause of the collapse was not immediately known.