The Cao Dai Temple was finished in 1955 when the Cao Dai Army was formed following the Japanese occupation of Indochina. Caodaists believe that all religions are ultimately the same and seek to promote tolerance throughout the world.
The Lord Buddha, Jesus Christ, Muhammad and Confucius, in addition to Joan of Arc and Julius Cesar are all honoured at this temple.
There are nine hierarchies of worship including a pope, cardinals and archbishop with festivals, rituals and prayer all practised regularly. The temple is similar in design to a Christian Cathedral featuring side aisles and an altar, as well as a long central nave, all positioned as they would be in a Christian Church, there is even a high dome decorated with clouds and saints.
The main focal point is a Divine Eye symbolising God which has the Ying and Yang icon in its pupil. Ceremonies take place daily with two services accompanied by musicians and a choir singing in English to traditional Vietnamese music.
http://www.vietnam-guide.com/ho-chi-minh-city/cao-dai-temple.htm