The predominant religion in Syria is Sunni Islam. Christians make up about 6% of the population. The largest Catholic communities are the Greek Melkite Catholics and the Syriac Catholics. There are also Maronites, Chaldeans, and Armenians. On the Orthodox side, the Greek Orthodox community is significant.
The Armenian Apostolic Church and the Syriac Orthodox Church are also present. There is a large Armenian community living mainly in Aleppo, descended from survivors of the 1915 genocide perpetrated by the Ottomans during World War I. There were approximately 250,000 Armenians in Syria in the early 1960s; by 2010, their number had fallen to 190,000.
Finally, regarding other minorities, there are other religious communities such as the Druze (1.5%), the Yazidis, and the Jews, who make up a small portion of the population (about 1%). Source: What Demographics Tell Us About the Syrian Conflict