The latest statistics on the religious composition of the population of Luxembourg are from the population census of 1970. At that time, the breakdown was as follows:
- Catholics — 96.9%
- Protestants — 1.2%
- Jews — 0.2%
- Other — 1.7%
Since 1979, the law prohibits any question about religion in population censuses.
It is clear from surveys conducted in 1999 and 2008 in the framework of the European Values Study published in 2002 and 2010 respectively, that Luxembourg has, despite its declared moral certainties, experienced a real collapse of the importance attached to religion, religious education and God, as well as religious practice.
In 1999, 22% of respondents said they went to church at least once a week (against 3% in 2008), 10% once a month (same in 2008), 35% occasionally (24% in 2008) and 33% never (37% in 2008).