In spite of the doubts of the U.S. based scholar voiced in the video, Thailand is very much becoming a more secular society. Organized religion is playing less of a role in peoples' lives. It is not that people are somehow becoming more anti-religious, a phenomenon we see here in the U.S. They simply are not all that interested in religion, esp. in a nation where one religion so thoroughly dominates the religious landscape as Buddhism does in Thailand. There was already less religious competition and fewer viable choices.
This clip is worth a watch. It runs for about 8 minutes. Enjoy.