It’s not easy to keep you religion in Thailand. There are not many places to worship other religions then Buddhism in Bangkok and if you look outside Bangkok its even worse. Some Catholic schools have established themselves in Bangkok and many of there students have later converted to Catholicism. There are a few churches with both Thai and western visitors and also there is a number off other religious places around Bangkok.
But still if you want to keep connected with your religion and you think that the number of Catholic churches in Bangkok is not enough please take a moment and listen to Catholic Show. It’s a podcast for Catholics and former Catholics that want to turn back to there belief.