President Abdel Fattah Al Sisi said Tuesday that the parliamentarians must study all problems and challenges that face Egypt, Al Bawaba News reported. Sisi added, during his speech in the birth of prophet Mohamed's celebrations, that the parliament members must have a great role during the coming period. The president pointed out that congratulating Christians on Christmas day is a part of Islam, stressing that the world was not created for one nation but for all nations, religions and sects.