A lot of people think that the Rastafarian Movement is just Marijuana and Bob Marley, but that is only because those are the 2 things that have been focused on in any Media coverage of anything Rasta. Even since Bob Marley died, Raggae has gotten more attention than any Rasta Church.
Rastafarians are not only Christian, but they smoke marijuana in accordance with the Bible. The Bible says not to get drunk, but it says all the Herbs are for you. Rastafarians identify with Ethiopia, in America we identify it with Jamaica because of Raggae and Marijuana and Jamaica is close, but Rastafarianism is about Ethiopia that is even where the Colors come from.
The Ethiopian Zion Coptic Church was probably the most Media covered Rasta church in America, they smoke Marijuana religiously, but they got caught importing thousands of pounds of Marijuana from Jamaica. They still use Marijuana legally, but everyone who was involved in the Illegal shipments got put in jail.
A lot of people have not heard of Marcus Garvey, but Marcus Garvey is an important part of American history. Marcus Garvey is the reason for the "Black Pride" Colors, and bringing Jamaica into the American conscious. If you asked most Americans to name a Jamaican, they would probably only know of Bob Marley. Marcus Garvey came to America around 1910 which was about 50 years after slavery ended, and he was appalled to see that no one that was his color was in charge of anything. So he went around North America and South America bringing his people together, and he started Black Wall Street (destroyed by the Oklahoma Bomber) and a Black Cruise Line called "The Black Star". It's pretty amazing, everyone should read about it.
Here is a video of the person who Rastafarians claim is the 2nd coming of Jesus. He was Emperor of Ethiopia and he visited Jamaica and America and did all kinds of stuff.
Click this link for an explination of how Marijuana is a defended religious right.