Buddhism first appeared in Laos during the eighth century A.D., as shown by both the Buddha image and the stone inscription found at Ban Talat near Vientiane, now exhibited at Hor Pra keo Museum. After the foundation of the unified Kingdom of Lane Xang, King Fa Ngum (14th Century) declared Buddhism as the state religion and urged the people to abandon Animism or other beliefs such as the Cult of Spirits. His policy meant to develop the Lao culture based on a common faith: Theravada Buddhism.
Today, Theravada Buddhism is the professed religion of about 90% of Lao people. Buddhism is an inherent feature of daily life and casts a strong influence on Lao society. Lao woman can be seen each morning giving alms to monks, earning merit to lessen the number of their rebirths. It is expected that every Lao man will become a monk for at least a short time in his life.
Traditionally, men spent three months during the rainy season in a Wat (Buddhist temple). Today, however; most men curtail their stay to one or two weeks.
Lao religious images and art is also distinctive and sets Laos apart from its neighbors. The "Calling for Rain" posture of Buddha images in Laos, for example, which depicts the Buddha standing with his hands held rigidly at his side, fingers pointing to the ground, can not be found in other Southeast Asian Buddhist art traditions. Religious influences are also pervasive in classical Lao literature, especially in the Pha Lak, Pha Lam, the Lao version of India's epic Ramayana.
Projects are underway to preserve classic Lao religious scripts, which were transcribed onto palm leaf manuscripts hundreds of years ago and stored in Wats.