Muhammad, about 1,400 years ago,  received the sacred words of the deity. The Qur'an, given to Muhammad (pbuh), by the deity through the Archangel Jibraeel, gives instruction for a complete way of life that is the will of the deity and is to ultimately involve all people on earth. "Submission to Allah" is a central vision. Observance of witness, prayer, almsgiving, fasting and pilgrimage are focal points for Islam and the individual Muslim. Friday is the day for meeting at the mosque for assembly prayers and sermons. Primary Holy Day observances are Eid Al-Fitr and Eid Al-Adha. 

Links:
          Moonsighting  - a comprehensive site with a variety of 
          information on moon sighting and related matters. 
           On line Islamic Greeting cards - Several leading sources.
           101 Ramadan Greetings - Ramadan ecards and greetings.