Because of the differences between the Islamic calendar and the Gregorian calendar, the most "holy" month of Ramadan, observance of which is one of The Five Pillars of Islam, is held at a different time every year. Although both the Hadiths and the teachings of Mohammedan scholars disagree, the month generally is considered to begin when the new or crescent moon is first seen at a certain time of year - - - it could be November, it could be September. This year, it begins on July 8, and ends on August 7.
This preoccupation with the moon, along with the symbolism of the crescent in Islam, leads some people to say that Islam is "moon worship." That's not entirely correct, but it's not far wrong. Moon worship existed in the Arab world long before Muhammad's grandmother was born; it was just one of many elements, like sections of the Bible, that the "Prophet" appropriated when he created his "religion." He knew that worship of the moon was an old Arab custom, so he incorporated it into his homemade "revelation." This was just one of many aspects of ancient Babylonian idolatry he adopted, but it doesn't mean that Mohammedans only worship the moon. The moon, like Mohammad himself, is only one of Islam's "gods," no matter how hysterically and homicidally the Muslims proclaim themselves to be "monotheists."
In any event, Ramadan 2013 is right around the corner. On behalf of all Christians, Jews, and sane people, and in the spirit of ecumenism, I offer the following, which should be adopted as the official anthem of Mohammedanism. It is performed by Thea Gilmore: