RASTAFARIANISM is the religion.  A RASTAFARIAN is a member or follower.  The religion originates out of Jamaica.  The idea is that blacks are the chosen people, that Emperor Haile Selassie of Ethiopia was the Messiah, and that black people will eventually return to their Africa.

There are strict codes of behavior and dress: MUSTS:

Dreadlocks 
Smoking of cannabis
The rejection of Western medicine
Adherence to a diet that excludes pork, shellfish, and milk.