For much of Vietnamese history, Mahayana Buddhism, Taoism and Confucianism have been the dominant religions, strongly influencing the national culture. About 85% of Vietnamese identify with Buddhism, though not all practice on a regular basis. According to the General Statistics Office of Vietnam's report for 1 April 2009, 6.8 million (or 7.9% of the total population) are practicing Buddhists, 5.7 milion (6.6%) are Catholics, 1.4 million (1.7%) are adherents of Hòa Hảo, 0.8 million (0.9%) practise Cao Đài, and 0.7 million (0.9%) are Protestants. In total, 15,651,467 Vietnamese (18.2%) are formally registered in a religion. Reportedly, 81% of Vietnamese people do not believe in God.
According to the 2009 census, while over 10 million people have taken refuge in the Three Jewels, the vast majority of Vietnamese people practice ancestor worship in some form.
About 8% of the population are Christians, totalling around six million Roman Catholics and fewer than one million Protestants, according to the census of 2007. Christianity was first introduced to Vietnam by Portuguese and Dutch traders in the 16th and 17th centuries, and was further propagated by French missionaries in the 19th and 20th centuries, and to a lesser extent, by American Protestant missionaries during the Vietnam War, largely among the Montagnards of South Vietnam. The largest Protestant churches are the Evangelical Church of Vietnam and the Montagnard Evangelical Church. Two-thirds of Vietnam's Protestants are reportedly members of ethnic minorities.
The Vietnamese government is widely seen as suspicious of Roman Catholicism. This mistrust originated during the 19th century, when some Catholics collaborated with the French colonists in conquering and ruling the country and in helping French attempts to install Catholic emperors, such as in the Lê Văn Khôi revolt of 1833. Furthermore, the Catholic Church's strongly anti-communist stance has made it an enemy of the
