There is no concrete evidence that the Star of David is related to religion. In Hebrew it's called Magen David - David's Shield, it it could simply be that King David's shield had this shape. Being the most popular king and warrior that we ever had, it would make sense that the shape became popular However there are lots of theories about the connection between the shape and religion - many of them can be found at http://www.answers.com/topic/star-of-david-1
The star of David is a factor in Judaism.
Judaism
The Star of David.
The five-sided Star of David
It is the Magen David or Star Of David for the nation of Israel. It is the menorah for the religion.
There is no such thing as a "Star" of David. This is a misnomer that originated among non-Jews.Magen David is the Hebrew name for the Shield of David.Magen David means "Shield of David" - and King David's shield was supposedly shaped like the Star of David. The actual origin of the Shield of David is unknown, though it first appeared in the Middle Ages.
Christianity is a cross, or crucifix. Judaisim is the Star of David. Islam is the moon with the star.
Wil has, basically, no participation in religion. He got the star of David for his mom.
christian/jewish - hence star of david in annual xmas stars
A hexagram is a six-pointed star. It is a combination of two equilateral triangles. It is commonly known as the Star of David or the star that the signifies the Jewish religion.
No religious symbol for Islam religion as the Cross in Christianity or David Star in Judaism.
Our religion does not permit us to wear a cross. No ornament is required, but if a Jew does wear an ornament it will most likely be a six-pointed Star of David.