You don't need to have a strong religious faith to appreciate the peaceful atmosphere of Divino Espirito Santo Cathedral. Inquire when the next mass starts or when you can go for a wander through.
To visit this principal church, find your way to Setor Santa Maria. There are loads of other things to see in the area, such as Federal University of Goias, Juscelino Kubitschek Memorial Park, and Jatai Municipal Stadium.