A second reason: The only event Jesus specifically instructed his followers to commemorate was his death, not his birth, and this was to be done as a simple communion meal.
والسبب الثاني هو ان المناسبة الوحيدة التي اوصى يسوع اتباعه ان يحتفلوا بها هي ذكرى موته ،‏ لا ولادته .‏