Ninety-five-percent of Thais are Buddhist. They
practice the
Theravada or "old school" of Buddhism. There are temples
and monks
nearly
everywhere you go .. see Therveda Buddhism - Thailand
Thai religion is also heavily influenced by
Hinduism. You will frequently see statues of Hindu gods and goddesses.
Finally, there are many elements of animism. The
most visible signs of animistic influences are the numerous "spirit
houses" near
many businesses and some homes.
These small (actually some are pretty
big) houses
atop pedestals are given offerings of food, drink and flowers to show
respect
and gratitude to the spirits of the land.
Tourists are welcome at temples (called wats). Many
monks like to practice their English. You should dress respectfully, take off
your shoes before entering a temple and behave respectfully toward Buddha
images (e.g., do not climb or sit on them).
Of the remaining 5% of Thais, most practice Islam.
Provinces in the far South of the country are primarily Muslim.
Christians, Hindus and Sikhs make up a tiny
percentage of the population.
For the most part, Christian religious services are
only found in urban areas, although there is the occasional one in rural
Thailand.
As far as churches go, Catholic and Baptist seem to be the most
common.