Observant Muslims practice five principles (pillars) of Islam: orally declaring their faith (shahadah); praying five times a day (salat); fasting in the daylight hours during the month of Ramadan (sawm); giving a share of their income for charity (zakat); and making a pilgrimage to Mecca at least once in their lifetime if they can afford it (hajj). Many Muslims also observe dietary rules, in origin similar to those of Judaism, that forbid certain foods (like pork), outlaw alcohol, and dictate how animals should be slaughtered for food.
In 2016, the survey Politbarometer provided data regarding religion by states of Germany for adults who are entitled to vote (18+)  , as reported in the table below.  Christianity is the dominant religion of Western Germany , excluding Hamburg , which has a non-religious plurality. Irreligion is predominant in Eastern Germany , which is probably the least religious region in the world.  [ full citation needed ] An exception is former West Berlin , that had a Christian pluarality in 2016 (% Christian and % Unaffiliated). It also has a higher share of Muslims, or %, compared to former East Berlin , with only % self-declared Muslims as of 2016.