San Agustin Church in Intramuros, Manila.
Completed in year 1607. It is the oldest church in the
Philippines.
St Paul's Cathedral in Macau was built by the Jesuits in 1602;
however, only the façade and the catacombs remain standing today,
so San Augustin in Manila may lay claim to the oldest standing
church in Asia.
Xinhua has reported the discovery of what may the be oldest
church in Asia; in the town of Abinsm in Inner Mongolia, about 500
kms North West of Beijing. it is believed to be around 700 years
old.