In Vietnam, Christianity ranks the 2nd (just after Buddhism) about the number of religious people. As result of 2009 Population & Housing Census, there are around 5,677,000 people in Christianity and that figure is accounted for 6.62% of national population.
Vietnamese people first known about Christianity in 16th century as missionary activities of Western missionaries. For a long later period, Western missionaries took efforts to widely introduce Christianity to people in all over the country. However, till Vietnam and France concluded the 1884 Protectorate Treaty (so-called the Treaty of Hue), which recognized French colonial protectorate in Vietnam; Christianity was allowed to have publicly work. At that time, Christianity was rapidly developed and witnessed a sharp increase in the number of Christians and churches.