Of religious teachings about alcohol, it reveals that Buddhism focuses on the individual, namely, it prohibits alcohol drinking to develop a person’s mind so that he can easily make his mind peaceful and achieve concentration (Samāthi) and finally insight (Paññā). Islam focuses on society, namely, it prohibits alcohol drinking to maintain a person’s life, religion, tribe, and wealth so that he can quickly and widely extend his religion and tribe. And Christianity does not prohibit alcohol drinking, if a person drinks in moderation, however it prohibits alcohol drinking to encourage good action so that a person does not commit an offence against the Lord. Regarding to religiosity and alcohol drinking of modern Thai youths, it shows that Thai youths who have religiosity at the low level tend to have alcohol drinking behaviour at the high level. They have religiosity at the medium level, they can have alcohol drinking behaviour at all levels. And we cannot predict the alcohol drinking behaviour, in modern Thai society, of those who have the high level of religiosity.