Christianity vs Islam

The Christian liturgical calendar varies by tradition but includes several widely observed seasons and feast days: [2][3]

Christmas (December 25 in Western churches; January 7 in many Eastern churches): Celebrates the birth of Jesus. The season of Advent (four weeks before Christmas) is a period of preparation. Easter: The most important Christian feast, celebrating the resurrection of Jesus. The date varies annually (March-April in Western churches; sometimes different in Eastern churches due to calendar differences). Holy Week, including Palm Sunday, Maundy Thursday, and Good Friday, precedes Easter. Lent: A 40-day period of fasting, prayer, and penitence before Easter, observed in Catholic, Orthodox, Anglican, and many other traditions. Pentecost: Celebrated 50 days after Easter, marking the descent of the Holy Spirit on the apostles. Epiphany (January 6): Commemorates the visit of the Magi in Western tradition and the baptism of Jesus in Eastern tradition. [2][3]

Catholic and Orthodox churches observe extensive calendars of saints' days, Marian feasts, and other commemorations throughout the year. Protestant observance of the liturgical calendar varies widely, with some traditions following it closely and others focusing primarily on Christmas and Easter. [2][3]

Major Islamic holidays follow the lunar Hijri calendar, so their dates shift approximately 11 days earlier each year relative to the Gregorian calendar: [2][3]

Eid al-Fitr: A joyous celebration marking the end of Ramadan, featuring communal prayers, feasting, charity, and family gatherings. Eid al-Adha: The "Festival of Sacrifice," commemorating Abraham's willingness to sacrifice his son. It coincides with the Hajj pilgrimage and involves the ritual sacrifice of an animal, with meat distributed to family, friends, and those in need. Ramadan: The ninth month of the Islamic calendar, during which Muslims fast from dawn to sunset. It commemorates the month in which the Quran was first revealed. Laylat al-Qadr (Night of Power): Observed during the last ten nights of Ramadan, believed to be the night the first Quranic revelation was received. Mawlid an-Nabi: The birthday of the Prophet Muhammad, celebrated in many Muslim communities with prayers, recitations, and gatherings, though some Muslims consider this observance an innovation. Ashura: The 10th of Muharram, observed as a day of fasting by many Sunni Muslims and as a day of mourning by Shia Muslims commemorating the martyrdom of Husayn at Karbala. Islamic New Year (1 Muharram): Marks the beginning of the Islamic lunar calendar year. [2][3]