Mui's film career ran throughout the 1950s, at a time when mainstream cinema in Hong Kong was just beginning to challenge the conservative Asian culture.
In addition to teaching "speaking in tongues" as a means of salvation, she began promulgating "The Blood, Water and Holy Spirit", of which God had inspired her from her Bible readings of 1 John 5:6-8, but is actually a teaching that many Christians have always held dear: that Jesus shed His blood for the remission of sins, began His ministry when He was baptized, and ended His ministry when He sent down the Holy Spirit to build His church on the Day of Pentecost.
(It is believed by Bible scholars that the Apostle John wrote this letter to refute some erroneous beliefs of the Gnostics that Jesus was just a man and not God-in-the-flesh.)
Kong also taught her primarily female followers (of which several were former fans) teachings that bordered on numerology, including the "7.21 Inspiration" (referring to July 21), which she called the "rebuilding of the New Testament Church by the Holy Spirit."
Chang then moved to Southern California and became a pastor of a Pentecostal Christian church (Assemblies of God).